Can't take care of him, or doesn't feel like it anymore? I just jump to the conclusion that anyone who would put a dog down rather than try to find a new home for it is just too lazy to try. Anyone who really cared about their pet would have a hard time doing that. To me, it's a sign that that person shouldn't be allowed to have pets. I'm sure there are extenuating circumstances (the dog is vicious, the person is very ill, and has already tried everything in his power to place him with another family, etc).

I'm so glad he's found a good home!