there is no more affectionate, intelligent and obedient animal than a 'found' dog.
i found a flea-infested lab/whippet cross with a bullet hole in her hip on a drilling rig in the middle of nowhere, somewhere north of Lake Somerville. i took her home and fed her back to health. she was my constant companion for 13 years, and when i put her down, i was not right for a week, at least.
'found' dogs are best. probably my only successful relationship in my life.