C would be a loyal husky: takes you everywhere, is a good-looking canine, is clean and athletic, and has just about every feature expected from a dog.
Assembly would be Resident Evil's infected Doberman Pinscher. Fucking hardcore.
Lisp would be an ugly and rather flatulent pug, that is harmless and actually caring but for some reason no one wants to be around him.
C++ would also be a husky, but extremely spoiled and uneducated: pissing on the doormat, shitting on your bed, barking loudly and annoyingly, and so on.
Perl would be a rabid and scabbed street hound which nonetheless scares the hell out of your ass and which has breeded much more than you would ever dream to in your entire life.
Python would not be a dog, but a snake. Snakes are slow, odd-looking and useless.
Java would be a sterilized kitten, of the kind which serves as company for some 35-year old single loser who lives in the suburb.
Ruby would be a pet rabbit kept in a smelly and tight cage. (Note that dogs actually hunt rabbits.)