i have a 13 year old chow mutt bastard, and about 3 years ago he got jump on by a rott and what looked like a chow or something...

they were whipping up on him and i managed to get a shot off and hit the rott in the leg... didnt seem like it slowed him down much, because they both hauled ass

the vet bill ended up costing me around $400... and i told my dog that he is screwed if something else happens, because im not sinking anymore money into his ass... and i think he understood :P

good luck ford