[quote=@DarkwolfX37]
"Alley dog" really doesn't sound good.
Can anyone come up with a canine equiv to "alley cat" for me?
"Stray dog" or "stray mutt" don't really give me what I'm looking for.
I'm looking for something cute-ish but still insulting, and would make for something that would be commonly said. 
[/quote]

abandoned pup?