Samuel Govannucci says he got the small monkey, named Kira, about 10 years ago as he was recovering from an accident. He says the creature became more important when his wife was diagnosed with leukemia.
But the Pennsylvania Game Commission seized the monkey during a raid in April. On Wednesday Govannucci was found guilty of possession of a monkey without a permit.
The game commission says it rarely grants permits for monkeys because they can carry diseases potentially fatal to humans.
Amanda Govannucci says she has hearing problems and Kira would alert her when someone was at the door.
The Govannuccis say they'll appeal.