German Shepherd Q&A

I have an amazing 8.5 month English Mastiff. At what age does a female go into heat?

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Answers (2)

My females all started coming in around 11 months of age. DON'T breed her yet! She is still growing and is just a baby herself. Wait till she is at least 20 months before breeding her.

OFA will not accept Radiographs until they are 24 months old which is why a Mastiff should NEVER be bred before 24 months when all their health tests can be completed..

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