I used Mutt Muffs for the first time just a couple of weeks ago when working with firearms and doing protection work with my Dutch Shepherd's dog's (Saker) trainers from Svalinn. I was very impressed by the product and just ordered one today. As you can see from the pictures the Mutt Muffs hold on to the head extremely well even after a lot of movement.
Happy user.

Fahim S.