Both Boxers and Mastiffs are normally fine with other dogs of the opposite sex, but it all depends on the individual dog. He may not like other dogs, he may love them, he may play too rough, he may be a gentleman, he may hate small dogs but like big dogs....it all depends.
Young dogs don't always get along with other dogs either. I have a one year old Collie/Aussie mix and she is iffy around other dogs. Even when she was a puppy she would growl and bark at strange dogs.







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Some puppies may be too playful or energetic and annoy an older dog in the house, and the older dog may snap and growl or bite the puppy. But you should NEVER leave new animals alone unsupervised to begin with. When you can't supervise, separate the puppy from the rest of the household animals so an accident won't happen.

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