I'm not really a fan of toilet humour either. Although in Sims Freeplay, one time I got up to walk with my iPad to the kitchen and the Sims started losing their footing and acting like they were in an earthquake and then they all got dizzy and vomited on the ground. That was hilarious. :joy:
For the pets, I always get the self-cleaning litter. It's great, shoots lasers at the cat poop, you don't have to do anything.
For the dogs, not much you can do otherwise consider creating a robot dog in CAS. I wish we could teach them to do their business in a certain place.