This poor animal is indeed in pain and has come to the end of his earthly life. You need to forget about everything now but his pain and that he depends on his human companions to do whats right for him. Just take him and do it now. The longer he is kept the more he will suffer, you all will suffer. It's time Janis and he'll thank you for helping him out of his earthly, pained body. I have had to do it for my 2 Maltese who were 15 years old and had liver cancer, and a German shepard I found wondering the desert. He had a brain tumor and had to be put down 7 months after I brought his body and spirit back to life. Its such a hard thing to do, to have to admit there is nothing you can do to save these wonderful,loving babies. I don't envy you this but please be strong, do it now for his sake. Putting him out or in the garage doesn't help and puts him in grave danger as you've seen....I pray for you all.