dogs who train the muscle

afternoon aggression anger animal bark barking best big bite bitework black breed breeding building bulldog bulldogg california carry closeup comfort country cozy dog dogs dogsport english estate eyes fast front german grass green grip gripwork guard guarding head life lifestyle living look mansion mean mouth muscle natural nature nose obedient old open outdoor park pet pets play playing portrait property protect protection protective residence reward rottweiler schutzhund security stability struggle teeth tires tongue toy train trained training tug wait yard