Tramps and Dogs

Every tramp seems to have a dog tied to him with a piece of string.

The tramps are always smelly, useless layabouts begging on the street

The dogs are always film-stars in waiting, with that cute mongrel crossbreed look, characterful faces and are always even tempered good natured beasties, relaxed at lying in busy doorways, on highstreets and at cashpoints.

How does this happen?

What attracts such nice dogs to such uselss owners in the first place ? Surely they could find someone a little better ....