Capitol Critters (1992)

Jammett becomes a local drug dealer when he starts selling caffeine pills to a squirrel named Opie. Max despises him for this, but Max soon gets into trouble himself when some tough pill-pushers think he's the one selling to Opie and don't like others taking over their business. They overdose Max on pills in order to kill him and this greatly upsets Jammett, who also learns Opie stole all of his family's food in order to pay Jammett for the pills he got!