If the reason you want to know that is a female cat drives you crazy during the spring and summer, the answer is GET HER SPAYED. Kittens only two months old who weigh only three pounds are ready for the surgery, but as long as the cat is OK with general anesthesia, it is never too late.
When it gets spayed or gets so old that the ovaries stop producing estrogen, which may be never until it dies.
Yes when they are very old or become very ill.
After two weeks of it first starts of having its period.
Dogs never stop going on heat, although the amount of blood lost can reduce.
Unless you want your dog for breeding, please get her spayed! Spaying the dog stops her from going in heat. Also if you do not, 50% of female dogs that have not had puppies and are not spayed get Pyometra, a disease of the uterus.
There is no easy way to stop dogs from sniffing each other as this is the way dogs find out information about things. A male dog does not go into heat. Only female dogs do.
Have you had them spayed?
The only way to stop your dog going into heat is to get her spayed, her heat cycles won't stop naturally.
Buy a fence.
No, male dogs can smell a female in heat from 3 to 5 miles away, the only way to stop it is to have her spayed.
A female dog will most likely stay in heat for about 21 days. 7 days coming in heat, 7 days in heat, and 7 days going out of heat. You will most likely notice some bleeding for about 7-10 days. From experience females are most receptive to males for 7-10 days after they stop bleeding.
A female cat is fertile its entire life. Spay your cat to stop it from going into heat in the future.
When it is pregnant or has been desexed.
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It will stop bleeding after a while or it will not bleed at all