There is something depressing about it and it's not really about dogs. Except for some superficial bow-wow stuff at the start, the dogs all represent human types which is where it gets into real trouble. Lady, the ostensible protagonist, is a fluffy blond cocker spaniel with absolutely nothing on the brain. She's great looking but, let's be honest, incredibly insipid. Tramp, the love interest is a smarmy braggart of the most obnoxious kind, an oily jail bird out for a piece of tail or whatever he can get.
No, he's a self confessed chicken thief; an all around sleaze ball. What's the function of a film of this kind? Essentially it's a primer about love and marriage directed at very young people, imprinting on their little psyches that smooth talking delinquents recently escaped from the local pound are a good match for nice girls in sheltered homes. When in ten years the icky human version of Tramp shows up around the house their hormones will be racing and no one will understand why. Films like this program women to adore jerks.