How long does a dog’s period usually last When a dog has a period, it usually lasts between 7-14 days, although the exact duration of the physiological period also varies from dog to dog, with some dogs having a longer period while others have a shorter period. A dog’s menstrual blood is usually in drops, though it is best to put physiological pants on your dog. Dogs usually have their first period at 7 to 8 months of age, and a dog’s period generally means that the dog is in heat. If it is a puppy, the amount of menstrual blood may not be too much, but if it is a big dog, the amount of menstrual blood may be more, but dogs generally want to keep themselves clean, so when they come on their period, the dog will usually lick the menstrual blood off by itself, which is the main reason why the owner will not notice when the small dog comes on his period.
