Possible Clues:

• San Diego's __ Park
• Retailer with leashes and collars
• Source of Siamese supplies
• Retailer for Rover
• Chain with a cat/dog logo
• __ Park: San Diego Padres' home
• Chain with a dog-and-cat logo
• Retailer offering sitting and walking services
• Chain with a cat-and-dog logo
• Retail chain that owns PupBox