yes they do and you have to keep mopping it up an every time they sit then move there is a patch of red discharge
Pro-oestrus, where the vulva swells and there is clear, then bloody, discharge. The female is often nervous.
Dogs come into heat every 6 months.
Mare's often produce some additional vaginal fluid during heat due to hormonal changes. Technically this is a discharge however, with no description of the discharge being observed it is not really possible to know if it is normal. Yellowish, green, smelly, brownish, bloody...abnormal. Clear, translucent barely white probably fine.
Cows do not have periods. But they do show a little bloody discharge a few days after going out of heat. See the related questions below for more info.
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Every 6 months.
During oestrus (which lasts 4-8 days) when the discharge stops and ovulation begins.
During oestrus (which lasts for 4-8 days) when the discharge stops and ovulation begins.
No they can not and they will typically not let a male mount them if they are not in heat.
Colloquially it's called "heat", the medical term is oestrus (pronounced and sometimes spelled without the o). Technically it's not quite the same as a "period," the bloody vaginal discharge exhibited by some dogs is not menstruation, and occurs before, rather than after, ovulation.
I take it by "bleed" you mean the bloody discharge when he is on heat/in season? This typically lasts 5-21 days depending on the breed etc, most breeds will be 21 days.
If she is not spayed she is likely coming into a heat cycle. Dogs are usually in heat for about 3 weeks. The first week they have a red discharge, then the second a clear or straw colored discharge, then almost no discharge the last week. Dogs go into heat at any time between 6-12 months usually. They are not normally bred until their third heat to make sure they are mature in body and mind before having to raise pups of their own. Usually they come in heat every 6 months after the first heat. You have to keep them away from all male dogs the entire heat cycle to avoid pregnancy and this includes not leaving them unsupervised in your yard as males may go over or under fences to get at a female in heat. If she is spayed sometimes a hormonal imbalance can cause swelling of the vulva. This can be from illness or a tumor. Hope this helps you!