A dog's bloody discharge during heat starts very bloody (deep red) and gradually becomes lighter, thinning to a watery, pinkish, or straw-colored discharge as the cycle progresses, sometimes appearing yellow or brownish, changing color as hormones shift from the initial bloody phase (proestrus) to the fertile phase (estrus).
Signs your dog is in heat
Physical signs of heat include: their vulva becoming red and swollen. bleeding from the vulva – usually a red, watery red, or yellowy brown discharge. peeing more than usual.
The earliest sign of estrus is swelling or engorgement of the vulva, but this swelling is not always obvious. Bloody vaginal discharge is often the first sign that an owner notices when their dog comes into heat. In some cases, the discharge is not apparent until several days after estrus has begun.
Bloody Discharge
However, if your dog has been spayed or you know it is not time for your unspayed dog to go into heat, the bleeding could be a sign of a potentially serious health problem. If you see blood coming from your dog's vulva, it could be a result of: Trauma. Tumors.
Overview. A heat/season is the fertile period of a dog's cycle when they can get pregnant. Dogs usually have their first heat at around 6 months old, and then every 6-7 months afterwards. Each heat tends to last approximately 16-18 days.
Remove Them From Heat
If you notice that your dog is overheating, your first step is to get them out of the sun immediately. If you can, take them indoors immediately and provide them with water and a cool place to lie down.
This fertile period occurs during the estrus phase, typically beginning around 7-10 days after the onset of bleeding. During this time, the vaginal discharge changes from bloody to straw-colored or clear, and your dog becomes receptive to males.
Excessive licking could cause dryness and irritation. If you are not choosing to keep her covered with a heat diaper, you can keep her contained in a room or crate to help keep the rest of your house clean. Dog wipes are perfect easy solutions for wiping away discharge while she is in heat.
You know when a heat cycle has ended when the vulva starts to shrink back to normal size and your dog begins to behave normally again. They will stop attempting to mate with male dogs and they shouldn't have any vaginal discharge after their heat cycle is over.
Estrus Cycle (Heat)
When a female dog is in heat, bloody or pink-tinged discharge is normal. It typically lasts two to three weeks, and the amount may vary.
Female dogs generally experience heat cycles up to two times annually. During these times a number of hormonal changes take place in the dog's body which can result in unique odors associated with various stages of the dog's fertility season.
4 Signs Your Dog Is Going into Heat
Most breeds have their first heat at about 6 months old but it may be earlier or later. A heat can usually be identified when there is some bleeding from the vagina, a swollen vulva or increased urination. Female dogs do not produce very much blood however, and in a small dog you may not even notice the bleeding.
Because blood traveling from the lungs to the body usually contains lots of oxygen, blood in the arteries is normally red. Much of the oxygen is removed from the small capillaries by the body tissues, so blood in the veins tends to be blue in color.
The most notable sign of a dog's heat cycle is bloody vaginal discharge, usually lasting between 14 and 21 days. The four estrous cycle stages include proestrus, estrus, diestrus, and anestrus.
While there is no pain felt during a dog's heat cycle, they will still appreciate being made to feel comfortable during this period of time.
Key takeaways: Most female dogs are in heat for 12 to 20 days, during which hormonal shifts prompt ovulation and behavioral changes that attract male dogs. The heat cycle includes two stages, which are part of the four-stage canine estrous cycle.
Ovulation occurs during the estrus phase, which follows the proestrus stage characterized by vaginal bleeding and swelling of the vulva. Ovulation in dogs typically occurs about 9 to 11 days after the onset of the estrus phase, but this can vary.
The 3-3-3 rule for dogs is a guideline for the adjustment period after adoption, outlining three phases: 3 Days (decompression, feeling overwhelmed/scared), 3 Weeks (starting to settle in, learning routine, personality emerges), and 3 Months (feeling secure, bonded, and truly at home). It helps new owners manage expectations and be patient as their rescue dog transitions, emphasizing calm energy, routine, and space in the early days to build trust.
Do not leave your dog outside and unsupervised: A female dog in heat who's also outside and alone is the perfect company for a passerby (or stray) male dog looking to mate. Walk your dog with a leash: To safely walk your dog while she's in heat, you should always keep her on a leash despite her obedience skills.
The female dog's scent in heat is a powerful attractant for male dogs. Bathing your female dog more frequently using a mild dog shampoo can help control her scent. Some pet owners also add a splash of apple cider vinegar to the bathwater, which can help mask the scent.
A dog's first heat cycle - or season - is not a fun time for you, or your pooch. It's messy, lengthy, and not all that comfortable for your pup but, unless you get your dog spayed, it's a normal and natural part of their lives.
Practical Hydration Solutions
Vulvar swelling should be taken as the first sign in addition to the female paying increased attention (such as licking the area) to her rear end. From the beginning of the heat period she will be attractive to male dogs, but will usually not be receptive, or allow mating, until about 7-10 days later.