Looks like Isis and Petunia are doing doggie WWE. Mine do that too, lots of teeth and growling, but no blood.
Yep!
They muzzle spar constantly.
Petunia is about 7 months old and Isis is about 7 years, so she helps me raise Petunia and keeps her in line with the growl and the fang.
No one gets hurt though. They are hilarious to watch.