My younger sister had a beloved dog that was 1/2 pit bull and 1/2 malamute. You could not have asked for a nicer, more well behaved dog. He was brindle and looked pretty much like a pit but his muzzle was a little lighter and must have been influenced by the malamute. However he had a mouthful of pit bull sized teeth and looked pretty scary when he smiled. His name was Har De Har Har for obvious reasons if you remember the cartoon.
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He once saved 'his' cat that was being chased by another dog, the cat ran up a tree and he positioned himself at the bottom and wouldn't let the other dog near it.

He had a good county home and owner but went to 'doggy day care' sometimes when she was out of town and couldn't take him. They let them all out to play but if any started showing aggression they had to go into a kennel for a time out and sit there and watch all the other dogs having fun. I don't know if that helped him to be what he was or he was just a good dog.

I'm not really a dog person but I even miss him, good old Hardy. :-)

judi