Dogs can smell health issues and help with mental health. Cats can also help with mental health but they are also calm and sometimes chill next to you. Rabbits, hamsters are just fluffy and mental health helper
Any animal should not be alone. Many bad things can happen to them: cars, sickness, rotten food can hurt strays. If you ever see a stray do not let it wander or save it by shelter, vet and other things. Save strays to give them a better life so if you do see one save it.
Cats and dogs are very important, they can do many things, they can be good pets and serves animals. Cats can clear up rodents and be cute and be a very good pet or serves animal. Dogs are very good to they bring joy everywhere unless the dog is aggressive same with cats they love to have pets once cured of their health issues.
Why animals at kill shelters get put down is us we ignore great dogs but go for the pretty ones. But still we need to stop and if they run out of room send some to another to clear up space unless in the adoption process they stay. And many animals across the world dont get second chances so lets make sure they do.