Aggresive ?

I have a female the same way normally it is after a catch but it can surface anytime, had a male that way as well. I carry a role of electric tape or a muzzle around and I keep it on them until i send them. That way if they try it they cant sink teeth and I can stomp em without getting bit. It sounds cruel but its the best way I have found. Shock collars are a big NO!!!!!!!!!!!!!!! as somebody already said they think its another dog biting them. I put the muzzle on them all the time only take it off for them to eat so they r as use to it as a collar. I use a hard plastic show sheep muzzle they can drink and breathe with it. I would muzzle her a few days and then let her run n the yard with other dogs with the muzzle keep a sorting stick handey and use it. I hope that helps.