Actually this raises an entirely new line of opportunities. Instead of simply selling clothing promoting Petplaces.com why not take it a step farther with slogans, photos, or other marketing efforts?
Some ideas: "My puppy found a play date. Petplaces.com"
"Throw me a bone. Petplaces.com"
"Cats rule, dogs drool. Petplaces.com"
"Hottest network on four legs. Petplaces.com"
If marketed correctly they could actually get some great traction.