@lindalu761 You could certainly remove Pets without uninstalling the rest of the game. But the issue is probably not in the program files. Pets is the most demanding expansion pack by a clear margin, and not all systems can run it properly. You might also have some corruption in your Sims 3 game folder, as in, the one in Documents\Electronic Arts.
A good test would be to pull that entire game folder out of Documents\EA and test in a completely new save. If pets act normally, then you'll know that the issue is your mods or cc—not necessarily pets-related content—or corruption in your game folder. You can test your mods and cc in batches in the new folder to see whether they still cause problems, remove the bad content, and copy over your saves and anything else you want to keep once the new game folder is running smoothly. If you'd like help with this process, let me know.
If, on the other hand, you'd prefer just to uninstall Pets and move on, then go ahead. The one extra step you'll need to take is to delete the registry entry for Pets, or else you may not be able to launch your game at all. You can delete the entry manually or with a tool like Piriform's CCleaner. Please be careful, as deleting system entries can cause your computer to stop working entirely.
https://help.ea.com/en-us/help/the-sims/the-sims-3/manually-uninstalling-the-sims-3/
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I don't work for EA. I'm just trying to help fellow players with their games.
