There are several dog breeds that just seem to be harder to train as compared to others. In most cases, the size can be a big factor to this. No, not all hard to train dogs have a large build. Some of them are so small that they can also be quite damaging when not trained the right way. Thus, they also tend to be very destructive in the process. Then, there are those dogs that seem to be too active for their own good. These also have the tendency of being problematic in terms of the training process that needs to take place. Bullmastiff Dog Training Tips... The Bullmastiff is an extremely large breed of dogs that are notorious for their muscular build and very keen sense of smell. They are usually used more as sporting dogs rather than pets. But with the proper Bullmastiff dog training, this can change eventually. Think of the...