| 
                 
                    Closing price on 3/23/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    14.60 | 
                 
                
                    | High | 
                    14.70 | 
                 
                
                    | Low | 
                    14.40 | 
                     
                
                    | Volume | 
                    103,360 | 
                                 
                
                    | Split-adjusted Price | 
                    3.63 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PET Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                3/23/2011
             | 
            
                0.00 / 0.00%
             |             
            
                14.60
             |           
            
                14.70
             |               
            
                14.40
             |                           
            
                14.60
             | 
            
                14.60
             |                     
            
                3.63
             |                                 
            
                103,360
             |            
            
                 
             |                                       
         
    
        
            | 
                3/22/2011
             | 
            
                -0.10 / -0.68%
             |             
            
                14.70
             |           
            
                14.70
             |               
            
                14.40
             |                           
            
                14.60
             | 
            
                14.60
             |                     
            
                3.63
             |                                 
            
                97,270
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/21/2011
             | 
            
                0.00 / 0.00%
             |             
            
                15.20
             |           
            
                15.20
             |               
            
                14.60
             |                           
            
                14.70
             | 
            
                14.70
             |                     
            
                3.65
             |                                 
            
                220,960
             |            
            
                 
             |                                       
         
    
        
            | 
                3/18/2011
             | 
            
                +0.20 / +1.38%
             |             
            
                14.60
             |           
            
                14.70
             |               
            
                14.40
             |                           
            
                14.70
             | 
            
                14.70
             |                     
            
                3.65
             |                                 
            
                165,820
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/17/2011
             | 
            
                0.00 / 0.00%
             |             
            
                14.50
             |           
            
                14.90
             |               
            
                14.30
             |                           
            
                14.50
             | 
            
                14.50
             |                     
            
                3.60
             |                                 
            
                161,020
             |            
            
                 
             |                                       
         
    
        
            | 
                3/16/2011
             | 
            
                +0.30 / +2.11%
             |             
            
                14.00
             |           
            
                14.50
             |               
            
                14.00
             |                           
            
                14.50
             | 
            
                14.50
             |                     
            
                3.60
             |                                 
            
                265,950
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/15/2011
             | 
            
                0.00 / 0.00%
             |             
            
                14.00
             |           
            
                14.50
             |               
            
                14.00
             |                           
            
                14.20
             | 
            
                14.20
             |                     
            
                3.53
             |                                 
            
                161,290
             |            
            
                 
             |                                       
         
    
        
            | 
                3/14/2011
             | 
            
                -0.60 / -4.05%
             |             
            
                14.80
             |           
            
                14.80
             |               
            
                14.10
             |                           
            
                14.20
             | 
            
                14.20
             |                     
            
                3.53
             |                                 
            
                263,860
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/11/2011
             | 
            
                +0.70 / +4.96%
             |             
            
                14.60
             |           
            
                14.80
             |               
            
                14.60
             |                           
            
                14.80
             | 
            
                14.80
             |                     
            
                3.68
             |                                 
            
                397,280
             |            
            
                 
             |                                       
         
    
        
            | 
                3/10/2011
             | 
            
                +0.60 / +4.44%
             |             
            
                13.50
             |           
            
                14.10
             |               
            
                13.50
             |                           
            
                14.10
             | 
            
                14.10
             |                     
            
                3.50
             |                                 
            
                148,450
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/9/2011
             | 
            
                -0.10 / -0.74%
             |             
            
                13.60
             |           
            
                13.60
             |               
            
                13.20
             |                           
            
                13.50
             | 
            
                13.50
             |                     
            
                3.35
             |                                 
            
                98,190
             |            
            
                 
             |                                       
         
    
        
            | 
                3/8/2011
             | 
            
                0.00 / 0.00%
             |             
            
                13.50
             |           
            
                13.80
             |               
            
                13.50
             |                           
            
                13.60
             | 
            
                13.60
             |                     
            
                3.38
             |                                 
            
                103,230
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/7/2011
             | 
            
                +0.10 / +0.74%
             |             
            
                13.80
             |           
            
                13.80
             |               
            
                13.50
             |                           
            
                13.60
             | 
            
                13.60
             |                     
            
                3.38
             |                                 
            
                62,070
             |            
            
                 
             |                                       
         
    
        
            | 
                3/4/2011
             | 
            
                +0.10 / +0.75%
             |             
            
                13.50
             |           
            
                13.70
             |               
            
                13.30
             |                           
            
                13.50
             | 
            
                13.50
             |                     
            
                3.35
             |                                 
            
                147,490
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/3/2011
             | 
            
                -0.20 / -1.47%
             |             
            
                13.30
             |           
            
                13.70
             |               
            
                13.30
             |                           
            
                13.40
             | 
            
                13.40
             |                     
            
                3.33
             |                                 
            
                175,080
             |            
            
                 
             |                                       
         
    
        
            | 
                3/2/2011
             | 
            
                -0.70 / -4.90%
             |             
            
                14.40
             |           
            
                14.40
             |               
            
                13.60
             |                           
            
                13.60
             | 
            
                13.60
             |                     
            
                3.38
             |                                 
            
                277,340
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/1/2011
             | 
            
                -0.20 / -1.38%
             |             
            
                14.30
             |           
            
                14.50
             |               
            
                14.20
             |                           
            
                14.30
             | 
            
                14.30
             |                     
            
                3.55
             |                                 
            
                113,840
             |            
            
                 
             |                                       
         
    
        
            | 
                2/28/2011
             | 
            
                -0.30 / -2.03%
             |             
            
                14.80
             |           
            
                15.00
             |               
            
                14.40
             |                           
            
                14.50
             | 
            
                14.50
             |                     
            
                3.60
             |                                 
            
                143,680
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/25/2011
             | 
            
                +0.30 / +2.07%
             |             
            
                14.60
             |           
            
                14.80
             |               
            
                14.50
             |                           
            
                14.80
             | 
            
                14.80
             |                     
            
                3.68
             |                                 
            
                89,520
             |            
            
                 
             |                                       
         
    
        
            | 
                2/24/2011
             | 
            
                -0.40 / -2.68%
             |             
            
                14.50
             |           
            
                14.90
             |               
            
                14.30
             |                           
            
                14.50
             | 
            
                14.50
             |                     
            
                3.60
             |                                 
            
                387,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/23/2011
             | 
            
                +0.20 / +1.36%
             |             
            
                14.90
             |           
            
                15.10
             |               
            
                14.80
             |                           
            
                14.90
             | 
            
                14.90
             |                     
            
                3.70
             |                                 
            
                223,480
             |            
            
                 
             |                                       
         
    
        
            | 
                2/22/2011
             | 
            
                -0.60 / -3.92%
             |             
            
                14.80
             |           
            
                15.10
             |               
            
                14.60
             |                           
            
                14.70
             | 
            
                14.70
             |                     
            
                3.65
             |                                 
            
                502,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/21/2011
             | 
            
                -0.80 / -4.97%
             |             
            
                15.70
             |           
            
                15.90
             |               
            
                15.30
             |                           
            
                15.30
             | 
            
                15.30
             |                     
            
                3.80
             |                                 
            
                235,380
             |            
            
                 
             |                                       
         
    
        
            | 
                2/18/2011
             | 
            
                -0.30 / -1.83%
             |             
            
                16.40
             |           
            
                16.40
             |               
            
                16.10
             |                           
            
                16.10
             | 
            
                16.10
             |                     
            
                4.00
             |                                 
            
                185,140
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/17/2011
             | 
            
                -0.30 / -1.80%
             |             
            
                16.80
             |           
            
                16.80
             |               
            
                16.30
             |                           
            
                16.40
             | 
            
                16.40
             |                     
            
                4.07
             |                                 
            
                107,970
             |            
            
                 
             |                                       
         
    
        
            | 
                2/16/2011
             | 
            
                +0.10 / +0.60%
             |             
            
                16.70
             |           
            
                17.00
             |               
            
                16.70
             |                           
            
                16.70
             | 
            
                16.70
             |                     
            
                4.15
             |                                 
            
                301,090
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/15/2011
             | 
            
                -0.10 / -0.60%
             |             
            
                16.50
             |           
            
                16.70
             |               
            
                16.50
             |                           
            
                16.60
             | 
            
                16.60
             |                     
            
                4.12
             |                                 
            
                118,940
             |            
            
                 
             |                                       
         
    
        
            | 
                2/14/2011
             | 
            
                -0.10 / -0.60%
             |             
            
                16.80
             |           
            
                17.00
             |               
            
                16.70
             |                           
            
                16.70
             | 
            
                16.70
             |                     
            
                4.15
             |                                 
            
                103,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                2/11/2011
             | 
            
                -0.20 / -1.18%
             |             
            
                17.00
             |           
            
                17.00
             |               
            
                16.70
             |                           
            
                16.80
             | 
            
                16.80
             |                     
            
                4.17
             |                                 
            
                218,840
             |            
            
                 
             |                                       
         
    
        
            | 
                2/10/2011
             | 
            
                +0.10 / +0.59%
             |             
            
                16.90
             |           
            
                17.00
             |               
            
                16.80
             |                           
            
                17.00
             | 
            
                17.00
             |                     
            
                4.22
             |                                 
            
                130,900
             |  
            
                 
             |                                                              
             
    
         
    
    
 |