What Are the Signs My Dog Is Coming Into Heat?

Most female dogs have two cycles of heat per year which allow the dog to release eggs and reproduce. These cycles start after the dog has reached puberty, usually between six and 24 months of age. Several warning signs will let you know if your dog is coming into heat.

  1. Swelling of the Vulva

    • One of the first warning signs is the swelling of the vulva, which can start a week or just the day before the dog begins to bleed. Monitor the vulva and you will begin to notice it increase in size and tip upward when the dog is beginning to come into heat.

    Vaginal Bleeding

    • A female dog will usually begin to bleed from its vagina when it is coming into heat. It is bright red at first and begins to dull when it comes into heat. If you are concerned about the blood that will be left in the house, keep the dog in an area of the house where the mess will not be a concern. Other options includes items such as dog panties that will keep the dog from leaving stains on the carpet.

    Increased Attention

    • You may start to notice stray dogs hanging around the house. When a female dog begins to come into heat, she will have a distinct smell that can be picked up on by dogs that are miles away. It is unlikely, however, that your female dog will accept males at such an early stage of the cycle.

    Behavioral Changes

    • Your dog may begin to hump your leg when you are not expecting it and may begin to lick herself more than usual. Other behavioral changes can include increased restlessness and increased urination.

    Acceptance

    • The next stage is when your dog will actually come into heat and accept mates. You would need to have your dog spayed before this point or keep her away from other dogs if you do not wish for her to get pregnant.

    Heat Cycle

    • A typical heat cycle lasts two to four weeks. Most female dogs will have cycles every six to eight months.

      When smaller dogs begin to come into heat, the characteristics may not be as noticeable. Monitor your smaller dog closely. The only warning sign you may notice is the increased attention from other dogs.

      Take your dog for a walk when she is in heat, but she needs to be monitored closely. Your dog will accept any male when she is in heat.