A Cook County judge found Kyle Voissem guilty of animal cruelty Tuesday.
He faces up to three years in prison when he is sentenced in May.
Prosecutors say he poured boiling water on his dog, because it urinated on the floor.
His dog suffered third degree burns on its neck and second degree burns over half of its body.
The dog survived and is now living with another family.
Voissem was forced to leave the UIC gymnastics team after his arrest.