Reasons for dogs not having their period:

1. It may be that the dog has not yet reached the estrus period, so it will not have its period.

2. The dog may be pregnant. In this case, you need to go to the hospital to check the dog’s health.

3. There may be a problem with the dog’s uterus or ovaries, causing the dog to miss its period.

Things to note when dogs are on their period:

1. During menstruation, keep your dog warm and avoid catching cold. You can use discarded clothes, blankets, etc. to make a mat for your dog to make it more comfortable.

2. It is best not to bathe your dog during its menstrual period, and you should often clean it of residual dirt.

3. The menstrual period of a female dog is actually the estrus period. During this period, there is a possibility of pregnancy when mating with a male dog. Pay more attention to the female dog and not let it run around to mate with other dogs.