Very unfortunate things happen to many of the animals simply because the main cast are animals, but there is no implication or portrayal of abuse outside of an abuse of power.
The main two child characters are threatened in a light or joking tone throughout the series, and children get hurt in combat, but there is no parental abuse.
Complicated answer. Things that happen to one animal and one side character can be considered torturous, and there may be an instance of offscreen torture implied. However, no cut-and-dry torture appears.