How long do dogs go into heat?

How Often Do Dogs Go Into Heat? Although it varies with different breeds and individual dogs, an unspayed female usually goes into heat twice yearly, about every six months. read more

First heat can vary greatly dog to dog. The youngest is about six months of age though sometimes a female will come into season younger. First heat can start as late as 12 or even 14 months of age or later in rare cases. Again, it can vary dog to dog. read more

Generally the dog comes into heat, and the experienced breeder notices right away, while the newbie may not notice till day four. Normally they are breedable on approximately day 12 to day 18, but they can remain in heat till day 21. read more