My sims cat got sprayed by a skunk

I don't think you can bathe cats in the game. I also never knew they could be sprayed by a skunk. You can shift-click the cat and choose make happy and that might work. Also, you might be able to find a treat from the vet clinic for it but I'm not sure. I've never encountered a smelly cat in game.

And now "Smelly Cat" from Friends is now stuck in my head.