Spike the Bulldog is an American bulldog who is often seen as a recurring antagonist in the Tom and Jerry series, though he is also a protector of sorts towards Jerry Mouse (he saved Tom Cat once in "The Truce Hurts"), sometimes going as far as being an enforcer of sorts to the mischievious rodent - however there is no denying that Spike is often unjustly cruel towards Tom (a stereotype of dog/cat rivalry) and although he often gives Tom several chances to avoid his wrath he will attack the cat viciously once those chances have been spent.