mods aren't working!
[ Spoiler ] I have been getting these update notifications when I first open the game and ,as a curious being, I clicked ok. It would restart my game and I would go back on. As backround information...
Forum Discussion
Cats & Dogs are an expansion to the sims 4 not a mod.
Move your Mods folder to the Desktop and delete localthumbcache.package. Then test the game
If it works now check for updates to your Mods and CC. Add it back a little at a time while testing until you have found all that are broken.
If you still have the issue rightclick the game in Origin and select Repair.
