Okay, so the day I got the game I loaded it to my computer, and claimed my Pet Shop from the Sims 3 Store. Kinda disappointed with the Pet Shop.
First, it took a while for me to find a lot to place it on my map. The "Late Night" town is not a good map for editing. Few open lots, and few open spaces to place a lot. Eventually I took out one of the clubs and put the Pet Shop in its place. Then I went in.
The shop is fine for buying "exotic" pets, such as a parrot, snake, turtle, lizard, and/or chipmunk. But you cannot buy dogs, cats, or horses in the shop. At least I couldn't, though I didn't venture outback, so maybe it's done out there. Otherwise, in order to get dogs, cats, and/or horses you have to search the computer (or possibly newspaper) for shelter pets to adopt or neighbors with pets up for adoption. Shelter pets tend to be adult to elder, while neighbors usually have baby versions.
Another thing with the Pet Shop, it sells a crate of toys, pet dishes, houses, etc., but all these items you can get in the "buy mode," just a few different variations. Like one of the pet houses at the shop isn't in the buy mode, but the buy mode does have one that is not in the shop. Same with pet beds, unless I just totally missed seeing the one I got in buy mode at the shop. And it isn't open 24/7, but doesn't show it's hours. I only know it's not always open becuase the first time I was there the clerk left and I couldn't do anything browsing or buying, and another time I got there and it was closed.
Oh! Hay (barrels/bundles) are also sold in the buy mode, don't recall them being for sell at the shop.
So that's all for the Pet Shop. As for the game itself, I've had stray cats shred up my newspaper (and have now canceled the service, no big), my dog can go in and out by herself unless I lock the door to pets, and I don't get the option to have the pet pee until the meter is almost all the way down. Maybe adding a fire hydrant will change this, I'll have to try this after work.
Oh! Something really annoying, I bought a "Biscuit Ball" but can't do a thing with it other than placing it somewhere. I try to click it to play with and just end up picking it up to move it. Am I suppose to be able to put treats in it? Be able to play with it? What is the point of the biscuit ball?
Well, that's my experience with TS3 Pets so far.