Ok, baisically I can't interact with any of my pets. The only way I can get my sims to play with them is if I make the pet interact with the sim. Before I delete all of my CC, does anyone know whether there is any specific scenery that could be causing the problem?
A mod conflict is possible, like Sirah81 mentioned. Have you used Delphy's Sims 3 Dashboard to check for mod conflicts? If there's a conflict, then you'll need to remove one of the offending mods.
However, another possibility is that you are running a mod that is not compatible with your patch level. Make sure that all of your mods are correct for your patch level. If you're not patched to 1.29, I honestly recommend that you do, especially if you intend to use mods. Mod creators generally do not maintain older mod versions, so keeping your game up to date means being able to keep using your mods.