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How often do female dogs go into heat? Is dog pregnancy 60 days?

Updated On September 23rd, 2025

Pet's info: Dog | Chihuahua | Female | unspayed | 1 year and 3 months old | 8 lbs

How often should Daisy come in season? She had a successful litter on 6/8/17! I am trying to figure out if she was in silent heat and got pg or if she's in heat now! Are all Chihuahua pregnancy different like it is with a woman or are they basically the same everytime? I am just a curious loving pet owner needing some advice that I can NOT find online.

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Answered By Vanessa Yeager DVM MPH

Veterinarian

Published on November 25th, 2017

Hi there and thanks for posting on Petco Pet Education Center, formerly Petcoach. Intact female dogs will come into heat twice a year- once in the spring/summer and once in the fall/winter. Estrus in dogs causes swelling of the vulva and vaginal discharge which may be straw to pink/red in color. A cycle in dogs can last for about 3-4 weeks. If she had her last litter in June, then it is possible she came into heat (estrus) this fall and if she was mated with a male during her estrus, then it is possible she may be pregnant. Pregnancy lasts for about 60 days in dogs. If you suspect Daisy may be pregnancy, I would recommend taking Daisy to her veterinarian for an exam and an abdominal ultrasound to confirm presence of pups. False pregnancy are not very common but can happen approximately 1-3 months after an intact female's lat heat. Symptoms will mimic true pregnancy but should subside in a few weeks. Pregnancy in dogs do not vary much, except for the number of pups and the length of the pregnancy to some extent. Typically 60 days is the gestation period, but may be a few days less or a few days more. I hope this helps and thank you again for posting!

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