If your dog gets along with dogs, I love mutually burning their energy with my own at a dog park. Enrichment games like “wait and search” Ive noticed keep every dog happy. If there is a safe walking path near your house, I can easily take the pup for a jog. Your animal will be leashed and I will be watching their body language to make sure at all times they arent being stressed out by too many new things. If they have a destructive streak in them I have some games involving cardboard boxes or old toys that I found redirecting destructive dogs to can really help With cats its a tough one, I like playing with cats but Ive been around cats that very much miss their people so I clean the litter box, once over the home for any messes which I then clean, top off food and water, and then I try to see if they want to either play or at least interact. Friendlier cats I of course play with and even try to give them some enrichment, I taught my own cats to play fetch. All other pets like fish that are very sensitive to over feeding I pay very close attention to how much and how often, being aware of how easy it is to trigger a bacterial or algea bloom. On top of food I monitor sunlight and I check all terrariums and aquariums for hitchhikers (my first aquarium taught me about the dangers of dragonfly nymphs)