Those of you who were mentioning the Jolly Farm thing were right on target as it happens.
I’m just annoyed that the Stewie who went to the store with Vinny didn’t hint to Brian “hey, dude, in about a month, try to persuade someone to adopt a dog named Vinny”. As annoying as the whole story arc was, Vinny was nice to the family (including helping Stewie even though he knew it would mean he wouldn’t be their dog any more), and deserved to find a home.