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My dog's progesterone is 63.3, 4 days into her heat. When to breed?

Updated On September 23rd, 2025

Pet's info: Dog | English Toy Spaniel | Female | unspayed | 7 years and 7 months old | 18 lbs

progesterone is 63 .3 what is the breeding window SHE IS ONLY 4 DAYS INTO SEASON

1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on September 21st, 2017

Ovulation typically occurs when progesterone blood levels reach 5-6ng/ml. If Sadie is at 63.3ng/ml, she should be bred immediately IF she is receptive. If she isn't, you may need to wait until her next cycle to breed her. Given her age however, this would not be recommended.

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