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It depends on their age, are they still intact (not neutered), their temperaments, etc.

I would not bring in 2 mature male Mastiffs together with no preparation. If you wish to keep 2 male mastiffs then I recommend you neuter them both first, introduce them slowly & properly. Keep them at first in separate areas where they can see each other. It is better to keep one of each sex if you wish to have 2 dogs. Keeping 2 males together is asking for trouble. It has been done but with people who know what they are doing. This is a large breed and once you have that first fight, they will hate each other forever.

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15y ago

What else can I help you with?