A couple of weeks ago, a resident at one of my properties moved out, left their dog, and left no forwarding/contact information. None of the neighbors wanted to take her in, so she came home with me and Milo. She is a small terrier/scruffy type dog, about 12 lbs. I took her to the vet, vet said she was about 10 years old, she needed to be groomed, takes allergy medicine, needs a lot of dental work. At first, I was happy to help her out, she was scared, and not at all familiar with being part of a family. She has come out of her shell now, but is not quite fitting in. Milo and I take a lot of walks, a lot of training, he's part of the family. She (Rosie) is not interested in taking part of any of this, and Milo doesn't care for Rosie (not aggressive, but just not interested in being friends - he's more of a people dog). I find myself not taking Milo out as much to keep Rosie company, or taking them both out together, and not being able to do all of the things that we used to do together - he now have an older dog along with us, and she's not interested in joining in. She just doesn't fit in with what we do. I know if I take her to the pound, they will put her to sleep (she's old, has missing/bad teeth, a small bump on her nose (a cyst; the vet says its non-cancerous)... I don't think anyone would adopt her. So... what should I do? I don't want to be responsible for the dog being put to sleep, but cannot fit her in to out life. Advice?