Dogs 101- Bullmastiff

More on the Bullmastiff: http://animal.discovery.com/breed-selector/dog-breeds/working/bullmastiff.htm... <br /> <br /> Find Your Perfect Breed: http://animal.discovery.com/breed-selector/dog-breeds.html#mkcpgn=ytapl1 <br /> <br /> More Video: http://animal.discovery.com/videos/dog-breeds-a-k/#mkcpgn=ytapl1 <br /> <br /> <br /> Revered as a guard dog, the massive Bullmastiff knows how to pin its prey down without killing or hurting it. These dogs are also known as gentle giants