During the last days, several sites had the chance to ask questions to the producers of The Sims 3 Pets, and although is pretty much old information, there are some new and interestin details as well!

You can find the full articles here:

• SimGoodie
• SimsVIP
• iSims
• The Sims Slovenija
• SimsNieuws
• Sims.Mixei.Ru

(source: SimPrograms)

And here's the list of the most relevant info taken from the several Q&A:

• You can set the autonomy level for pets and Sims separately. So, if you don't want to control your four-legged friend, you can make the AI do it for you.
• Dogs and cats can play tackle with toddlers and children.
• Pets can sleep on beds and couches with Sims.
• When a pet dies, it turns into a ghost, which you can make playable at the Science Facility or bring back to life with ambrosia.
• There are no new cheats.
• Cats don't eat fish in the aquarium. But, when hunting, they can catch fishes in a river/lake.
• You can mix ingredients to create a Pet Gourmet (and grow carrots too).
• You can set doors to prevent pets from entering rooms and other areas.