When Should I Expect My Dog's First Heat? On average, most dogs will begin their first heat cycle between six and 15 months of age. The age of a dog’s first heat cycle varies greatly between breeds.

Dogs much like humans have a menstruation cycle but unlike their human counterparts, female dogs usually go into heat only once or twice a day and their average cycle is every 7 months.

False pregnancy in dogs is caused by normal hormonal changes that begin after every estrus cycle. The purpose of this change is to prepare your dog’s body for pregnancy.

While female dogs don’t experience periods in the same way humans do, the estrus cycle involves vaginal bleeding and discharge. Understanding the signs and stages of this cycle can help you care ...

University Animal Care Committee Standard Operating Procedure Document No: 7.25 Subject: Estrus Cycle Monitoring (Mice) Date Issued: March 24, 2017 Revision: 2 Location: Queen’s University ...

Samples from each canine female were taken biweekly to determine estrous cycle phase and for yeast isolation. The samples (n= 217) were obtained with curettes and sterile swabs with the aid of a ...