We have a mixed pit bull/husky/whatever dog who is a pet and also functions as the "guard dog" in that he roams around the property at night to intimidate small woodland critters who may have plans to come raid our poultry. He's not mean in any way, actually being somewhat of a wimp, but a dog is a dog and generally pretty intimidating to things like raccoons. He's probably 75 pounds, all muscle. He has run off deer, porcupines, raccoons, shadows and who knows what else but has finally met his match. Sunday night he was barking off in the woods, very agitated, and instead of going out to investiagte I just let him handle it. When he came in, he went to his corner and laid down like nothing was unusual. The next morning, we noticed a blood trail around the house and assumed one of the cats brought in a chipmunk to torment, so we went looking for the body. It turns out that the blood was the dog's, and that he had a slash on his nose and a big chunk of the side of his tail bitten off! I envision the encounter like this: Buster the dog sees a funny looking critter and goes over to sniff it. The critter turns, yowls, and gives him a slash aross the nose. Buster decides not to attempt to befriend the funny looking new cat, and turns to run home. The critter, really wanting to get his point across, lunges forward to bite off a chunk of tail to give the dog a permanent reminder to not sniff at a fisher cat. I took him to the vet, who gave us some painkillers and an antibiotic. There is not enough skin in the area of the wound to try and suture it up, so it will have to just heal over on it's own. For those who don't know, a fisher is a giant weasel sort of thing that is a super-predator. It has retractable claws and can run up and down trees like a squirrel. They get as big as 20lbs, and have no natural predators to fear. It is one of the only animals that can attack and kill a porcupine! Here in New England, we call them "fisher cats", but it is actually just a "fisher". It looks like a big, ugly cat, and screams with a blood-curdling sound that sounds like a woman being tortured. They have been known to rip open window screens to come into a house to get a cat or small dog. What Buster learned the hard way is that they are not friendly or intimidated by pit bulls.