Unless they are very sick and obviously in pain I would let them live where they are comfortable, which is with me where they have been most of their life.
Now I did have to put down my one dog several years ago , he stopped being able to even stand up or move on his own. The humane thing to do was put my poor guy out of his misery so I found a vet who made home calls and they euthanised him on his favorite spot on the couch surrounded by his loving family.
I would just let them live until the end of their life
You’re welcome Hillary
Our pets are loved until the end, either naturally or put to sleep by a vet if ill or suffering. We bury them in the garden and remember them forever ❤️
Thank you Cheryl.
I don’t have pets If I had one probably I would keep them and allow nature to take its course.
Thank you, Virginia.
You are welcome Hillary. Have a blessed day

Thank you, for the well thoughtful comment, Jacqueline.