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My dog is on her first heat. Is it too early to breed her?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Female | unspayed | 8 months and 19 days old | 6 lbs

Hi! I have a jack Russel/shitzu 8 month old Bitch. She is currently on her first heat. I have heard story's of having to leave your dog til their second heat before you start to breed as it can be dangerous. I am really wanting to breed with her but I am also worried for her safety... she's still seems so young to me. Could I possibly have you advice on this please as I don't want to make any decisions just yet. Thank you.

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1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on May 4th, 2017

Misty is adorable, so so cute! This is a great question! Yes, it is recommended to wait until at least a dog's second heat before breeding them. At the time of their first heat, a dog will not be fully grown, nor will they be emotionally mature, and this can lead to problems with giving birth and mothering ability. By the time a dog has their second heat, they will typically be matured both physically and emotionally, and that will make her a better mother. I definitely would recommend to wait until Mitsy has had at least her second heat before mating her. Good on you for asking for advice first, that's extremely responsible :-)

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