| 
                 
                    Closing price on 5/16/2012
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    13.50 | 
                 
                
                    | High | 
                    13.70 | 
                 
                
                    | Low | 
                    13.00 | 
                     
                
                    | Volume | 
                    341,850 | 
                                 
                
                    | Split-adjusted Price | 
                    4.24 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PET Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                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
             |            
            
                 
             |                                       
         
    
        
            | 
                4/19/2012
             | 
            
                -0.50 / -3.25%
             |             
            
                15.20
             |           
            
                15.50
             |               
            
                14.90
             |                           
            
                14.90
             | 
            
                14.90
             |                     
            
                4.19
             |                                 
            
                886,790
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/18/2012
             | 
            
                -0.50 / -3.14%
             |             
            
                15.90
             |           
            
                16.00
             |               
            
                15.40
             |                           
            
                15.40
             | 
            
                15.40
             |                     
            
                4.33
             |                                 
            
                642,680
             |            
            
                 
             |                                       
         
    
        
            | 
                4/17/2012
             | 
            
                +0.30 / +1.92%
             |             
            
                15.60
             |           
            
                16.10
             |               
            
                15.60
             |                           
            
                15.90
             | 
            
                15.90
             |                     
            
                4.48
             |                                 
            
                696,560
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/16/2012
             | 
            
                +0.70 / +4.70%
             |             
            
                14.90
             |           
            
                15.60
             |               
            
                14.90
             |                           
            
                15.60
             | 
            
                15.60
             |                     
            
                4.39
             |                                 
            
                815,300
             |            
            
                 
             |                                       
         
    
        
            | 
                4/13/2012
             | 
            
                -0.10 / -0.67%
             |             
            
                14.90
             |           
            
                15.30
             |               
            
                14.80
             |                           
            
                14.90
             | 
            
                14.90
             |                     
            
                4.19
             |                                 
            
                761,910
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/12/2012
             | 
            
                -0.30 / -1.96%
             |             
            
                15.40
             |           
            
                15.50
             |               
            
                15.00
             |                           
            
                15.00
             | 
            
                15.00
             |                     
            
                4.22
             |                                 
            
                1,010,500
             |            
            
                 
             |                                       
         
    
        
            | 
                4/11/2012
             | 
            
                +0.30 / +2.00%
             |             
            
                15.40
             |           
            
                15.40
             |               
            
                15.00
             |                           
            
                15.30
             | 
            
                15.30
             |                     
            
                4.31
             |                                 
            
                728,070
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/10/2012
             | 
            
                +0.10 / +0.67%
             |             
            
                14.90
             |           
            
                15.40
             |               
            
                14.90
             |                           
            
                15.00
             | 
            
                15.00
             |                     
            
                4.22
             |                                 
            
                1,215,330
             |            
            
                 
             |                                       
         
    
        
            | 
                4/9/2012
             | 
            
                +0.40 / +2.76%
             |             
            
                14.60
             |           
            
                15.00
             |               
            
                14.50
             |                           
            
                14.90
             | 
            
                14.90
             |                     
            
                4.19
             |                                 
            
                786,650
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/6/2012
             | 
            
                0.00 / 0.00%
             |             
            
                14.50
             |           
            
                14.80
             |               
            
                14.40
             |                           
            
                14.50
             | 
            
                14.50
             |                     
            
                4.08
             |                                 
            
                493,930
             |            
            
                 
             |                                       
         
    
        
            | 
                4/5/2012
             | 
            
                +0.10 / +0.69%
             |             
            
                14.40
             |           
            
                14.70
             |               
            
                14.30
             |                           
            
                14.50
             | 
            
                14.50
             |                     
            
                4.08
             |                                 
            
                514,080
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/4/2012
             | 
            
                +0.20 / +1.41%
             |             
            
                14.30
             |           
            
                14.70
             |               
            
                14.20
             |                           
            
                14.40
             | 
            
                14.40
             |                     
            
                4.05
             |                                 
            
                868,170
             |            
            
                 
             |                                       
         
    
        
            | 
                4/3/2012
             | 
            
                +0.40 / +2.90%
             |             
            
                13.80
             |           
            
                14.30
             |               
            
                13.80
             |                           
            
                14.20
             | 
            
                14.20
             |                     
            
                4.00
             |                                 
            
                469,350
             |  
            
                 
             |                                                              
             
    
         
    
    
 |