Sims having Pets is a great addition to the Sim 1 collection. Probaly the best Sims 1 EP.
But back to cats and Dogs. You can addopt Cats, Dogs and all the rest by going down to, well, going up to Uptown or Community lots that are featured in the new massive neighbourhood.
You can also get Gothic Style Candle and mask shops. Or jazzy new york style cafes with the guy on the sax who tries to get on your nerves by following you arround and getting you stuck in the public bathroom. (yeah thats right, stuck, it happened to me twice!).
This is another review by Webmessia