I have a 2 yr old English Mastiff and her heat cycle is every 4 months. Should I be concerned with breeding?
Yes, you should be very concerned about breeding. If you aren’t familiar enough with Mastiffs to know about when their heat cycles normally occur, and you don’t have a mentor you can talk to about this, then this dog should NEVER EVER be bred.
The world doesn’t need more pets being bred, not when 2,000,000+ of them are killed each year in shelters. Fix your 8itch and get it over with. She is not breeding quality and there is nothing wrong with that.