I have had Jack russells for over 20 years. I’m not going to go that far back but our beautiful parsons jack russell has blessed us with 3 litters until she was spayed at 6. we kept 1 girl from her 1st litter and 1 from her 3rd. The eldest had her 1st litter 1 1/2 years ago and then she was spayed. Her last little girl had a beautiful litter recently and then she will be spayed as we are keeping 1 of her boys. We love our doggies and all they have given us and continue to do so. Good luck to us keeping the most gorgeous boy 🥰