Multiple instances of this occur when Air Bud visits Guantanamo Bay before the finals of the volleyball tournament. The eponymous canine even performs acts of torture himself at the behest of the US government. One particularly shocking scene sees him waterboarding a prisoner to extract information and then, when he divulges his secrets, Air Bud continues to waterboard the man for his own perverse enjoyment.
In one scene, the eponymous canine bites off a man's penis and devours it hungrily as his victim slowly bleeds to death. At a later point, we discover that Air Bud has developed a taste for human penis and he embarks on a penis biting spree that has little to do with the main plot and is quickly forgotten afterwards.
There is one particularly grisly scene where the eponymous canine "spikes" a volleyball onto a man's head with such force that it explodes in an eruption of gore, splattering bloody grey matter all over the terrified audience.