Bullmastiff
Bullmastiffs can grow very large and they don’t seem to be aware of their size. This can cause a potential problem especially if you have small children because this dog can easily knock your child down when they start running. They are also more aggressive than other breeds of dogs but their aggression can be trained as long as you show strong leadership. However, you need to train them early because they are difficult to train later in life. They look up to their human as the leader of the pack, so you should avoid showing signs of weakness.
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