| 
                 
                    Closing price on 6/4/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    12.10 | 
                 
                
                    | High | 
                    12.40 | 
                 
                
                    | Low | 
                    12.00 | 
                     
                
                    | Volume | 
                    588,500 | 
                                 
                
                    | Split-adjusted Price | 
                    3.80 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PET Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                6/4/2012
             | 
            
                -0.40 / -3.20%
             |             
            
                12.10
             |           
            
                12.40
             |               
            
                12.00
             |                           
            
                12.10
             | 
            
                12.10
             |                     
            
                3.80
             |                                 
            
                588,500
             |            
            
                 
             |                                       
         
    
        
            | 
                6/1/2012
             | 
            
                0.00 / 0.00%
             |             
            
                12.60
             |           
            
                12.70
             |               
            
                12.50
             |                           
            
                12.50
             | 
            
                12.50
             |                     
            
                3.93
             |                                 
            
                179,570
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/31/2012
             | 
            
                -0.30 / -2.34%
             |             
            
                12.70
             |           
            
                12.80
             |               
            
                12.50
             |                           
            
                12.50
             | 
            
                12.50
             |                     
            
                3.93
             |                                 
            
                249,160
             |            
            
                 
             |                                       
         
    
        
            | 
                5/30/2012
             | 
            
                0.00 / 0.00%
             |             
            
                12.70
             |           
            
                13.00
             |               
            
                12.70
             |                           
            
                12.80
             | 
            
                12.80
             |                     
            
                4.02
             |                                 
            
                101,830
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/29/2012
             | 
            
                -0.10 / -0.78%
             |             
            
                12.70
             |           
            
                12.90
             |               
            
                12.60
             |                           
            
                12.80
             | 
            
                12.80
             |                     
            
                4.02
             |                                 
            
                428,110
             |            
            
                 
             |                                       
         
    
        
            | 
                5/28/2012
             | 
            
                +0.20 / +1.57%
             |             
            
                13.20
             |           
            
                13.20
             |               
            
                12.70
             |                           
            
                12.90
             | 
            
                12.90
             |                     
            
                4.06
             |                                 
            
                224,970
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/25/2012
             | 
            
                +0.60 / +4.96%
             |             
            
                12.50
             |           
            
                12.70
             |               
            
                12.40
             |                           
            
                12.70
             | 
            
                12.70
             |                     
            
                3.99
             |                                 
            
                174,910
             |            
            
                 
             |                                       
         
    
        
            | 
                5/24/2012
             | 
            
                -0.30 / -2.42%
             |             
            
                12.40
             |           
            
                12.60
             |               
            
                12.00
             |                           
            
                12.10
             | 
            
                12.10
             |                     
            
                3.80
             |                                 
            
                290,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/23/2012
             | 
            
                -0.60 / -4.62%
             |             
            
                13.00
             |           
            
                13.00
             |               
            
                12.40
             |                           
            
                12.40
             | 
            
                12.40
             |                     
            
                3.90
             |                                 
            
                335,520
             |            
            
                 
             |                                       
         
    
        
            | 
                5/22/2012
             | 
            
                0.00 / 0.00%
             |             
            
                13.00
             |           
            
                13.40
             |               
            
                12.80
             |                           
            
                13.00
             | 
            
                13.00
             |                     
            
                4.09
             |                                 
            
                235,920
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/21/2012
             | 
            
                +0.60 / +4.84%
             |             
            
                12.40
             |           
            
                13.00
             |               
            
                12.40
             |                           
            
                13.00
             | 
            
                13.00
             |                     
            
                4.09
             |                                 
            
                471,780
             |            
            
                 
             |                                       
         
    
        
            | 
                5/18/2012
             | 
            
                -0.60 / -4.62%
             |             
            
                13.00
             |           
            
                13.00
             |               
            
                12.40
             |                           
            
                12.40
             | 
            
                12.40
             |                     
            
                3.90
             |                                 
            
                747,710
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/17/2012
             | 
            
                -0.50 / -3.70%
             |             
            
                13.40
             |           
            
                13.70
             |               
            
                13.00
             |                           
            
                13.00
             | 
            
                13.00
             |                     
            
                4.09
             |                                 
            
                422,850
             |            
            
                 
             |                                       
         
    
        
            | 
                5/16/2012
             | 
            
                +0.20 / +1.50%
             |             
            
                13.50
             |           
            
                13.70
             |               
            
                13.00
             |                           
            
                13.50
             | 
            
                13.50
             |                     
            
                4.24
             |                                 
            
                341,850
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/15/2012
             | 
            
                -0.60 / -4.32%
             |             
            
                13.90
             |           
            
                13.90
             |               
            
                13.30
             |                           
            
                13.30
             | 
            
                13.30
             |                     
            
                4.18
             |                                 
            
                874,300
             |            
            
                 
             |                                       
         
    
        
            | 
                5/14/2012
             | 
            
                -0.70 / -4.79%
             |             
            
                14.70
             |           
            
                14.70
             |               
            
                13.90
             |                           
            
                13.90
             | 
            
                13.90
             |                     
            
                4.37
             |                                 
            
                1,098,970
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/11/2012
             | 
            
                -0.50 / -3.31%
             |             
            
                15.10
             |           
            
                15.10
             |               
            
                14.60
             |                           
            
                14.60
             | 
            
                14.60
             |                     
            
                4.59
             |                                 
            
                699,130
             |            
            
                 
             |                                       
         
    
        
            | 
                5/10/2012
             | 
            
                -0.30 / -1.95%
             |             
            
                15.60
             |           
            
                15.60
             |               
            
                15.00
             |                           
            
                15.10
             | 
            
                15.10
             |                     
            
                4.75
             |                                 
            
                743,830
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/9/2012
             | 
            
                +0.10 / +0.65%
             |             
            
                15.00
             |           
            
                15.50
             |               
            
                15.00
             |                           
            
                15.40
             | 
            
                15.40
             |                     
            
                4.84
             |                                 
            
                695,820
             |            
            
                 
             |                                       
         
    
        
            | 
                5/8/2012
             | 
            
                -1.90 / -11.05%
             |             
            
                15.80
             |           
            
                15.90
             |               
            
                15.30
             |                           
            
                15.30
             | 
            
                15.30
             |                     
            
                4.81
             |                                 
            
                898,490
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/7/2012
             | 
            
                +0.80 / +4.88%
             |             
            
                16.70
             |           
            
                17.20
             |               
            
                16.60
             |                           
            
                17.20
             | 
            
                17.20
             |                     
            
                4.84
             |                                 
            
                1,917,740
             |            
            
                 
             |                                       
         
    
        
            | 
                5/4/2012
             | 
            
                +0.20 / +1.23%
             |             
            
                16.30
             |           
            
                16.60
             |               
            
                16.20
             |                           
            
                16.40
             | 
            
                16.40
             |                     
            
                4.62
             |                                 
            
                995,230
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/3/2012
             | 
            
                -0.10 / -0.61%
             |             
            
                16.20
             |           
            
                16.40
             |               
            
                16.00
             |                           
            
                16.20
             | 
            
                16.20
             |                     
            
                4.56
             |                                 
            
                862,470
             |            
            
                 
             |                                       
         
    
        
            | 
                5/2/2012
             | 
            
                +0.10 / +0.62%
             |             
            
                16.40
             |           
            
                16.70
             |               
            
                16.20
             |                           
            
                16.30
             | 
            
                16.30
             |                     
            
                4.59
             |                                 
            
                1,174,190
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/27/2012
             | 
            
                +0.70 / +4.52%
             |             
            
                15.70
             |           
            
                16.20
             |               
            
                15.40
             |                           
            
                16.20
             | 
            
                16.20
             |                     
            
                4.56
             |                                 
            
                1,881,420
             |            
            
                 
             |                                       
         
    
        
            | 
                4/26/2012
             | 
            
                0.00 / 0.00%
             |             
            
                15.60
             |           
            
                15.60
             |               
            
                15.20
             |                           
            
                15.50
             | 
            
                15.50
             |                     
            
                4.36
             |                                 
            
                645,060
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/25/2012
             | 
            
                +0.40 / +2.65%
             |             
            
                15.40
             |           
            
                15.60
             |               
            
                15.20
             |                           
            
                15.50
             | 
            
                15.50
             |                     
            
                4.36
             |                                 
            
                699,930
             |            
            
                 
             |                                       
         
    
        
            | 
                4/24/2012
             | 
            
                0.00 / 0.00%
             |             
            
                15.20
             |           
            
                15.20
             |               
            
                14.90
             |                           
            
                15.10
             | 
            
                15.10
             |                     
            
                4.25
             |                                 
            
                542,740
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/23/2012
             | 
            
                +0.10 / +0.67%
             |             
            
                15.20
             |           
            
                15.40
             |               
            
                15.00
             |                           
            
                15.10
             | 
            
                15.10
             |                     
            
                4.25
             |                                 
            
                200,900
             |            
            
                 
             |                                       
         
    
        
            | 
                4/20/2012
             | 
            
                +0.10 / +0.67%
             |             
            
                14.90
             |           
            
                15.20
             |               
            
                14.80
             |                           
            
                15.00
             | 
            
                15.00
             |                     
            
                4.22
             |                                 
            
                439,580
             |  
            
                 
             |                                                              
             
    
         
    
    
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