Mastiffs are large dog breeds that are known to be gentle giants. They are very clever and docile by nature, and they love nothing more than to be at home, and involved with everyone and everything. They form very strong bonds with their keepers. Mastiff dogs however may not be the best choice for first - time dog keepers because they need to be handled and trained at an early age so that when they mature they will be well - mannered pets. Mastiff...