Female dogs usually bleed for about 7–10 days during the early part of their heat (season), but in some dogs it can be as short as a few days or as long as 3–4 weeks.

Heat cycle basics

  • A female dog’s reproductive cycle is called the estrous cycle and is divided into several phases.
  • Bleeding is mainly linked to the first phase (proestrus), which marks the start of her coming into heat.

How long they bleed

  • Most female dogs have noticeable bloody discharge for around 7–10 days during proestrus.
  • In some dogs, bleeding can be lighter or heavier and may range from just a few days up to about 3–21 days, and occasionally close to 4 weeks.

What you’ll usually see

  • Common signs include a swollen vulva, blood‑tinged discharge, more frequent urination, and attracting male dogs while initially refusing to mate.
  • As she moves into estrus (the fertile window), the discharge often becomes lighter, pink or straw‑colored, and may decrease in volume.

When to call a vet

  • Contact a vet urgently if bleeding is very heavy, has a foul smell, your dog seems unwell (lethargic, vomiting, fever), or the bleeding lasts clearly longer than a month.
  • If bleeding stops very suddenly after only a couple of days or anything about the cycle seems unusual, a quick vet check is the safest option.

Simple home care tips

  • Use dog heat pants or washable pads to protect floors and furniture, and keep her indoors and away from intact males if you do not plan to breed her.
  • Keep the area clean, offer a calm environment, and ask your vet about the best timing for spaying if you do not want future heats or pregnancies.

Information gathered from public forums or data available on the internet and portrayed here.