Ashley,
I would recommend calling your vet to see if they will spay a dog in heat. It is riskier to spay a dog in heat because of the excess blood in the uterus during this period of time and the fact the tissues can be more fragile.
In answer to your question, dogs cycles last about 6 months. This time period can vary from dog to dog and in different breeds. However of the 4 phases, the 1st 3 phases are the ones that are going to concern you the most. The 1st stage last 7-9 days, during this period the vulva is swollen and the discharge tends to be bloody. During this phase the female will not allow the male to mount her. After this phase, starting around day 8-10 and lasting for about 2 weeks is actually standing heat. At this point she will allow the male to mount her and she can become pregnant. The 3rd phase can last up to 60 days. During this time the female will slowly begin to return to normal or if bred the puppies will grow. All dogs go through a false pregnancy during this phase.
I’m trying to not get to involved in the phases so that you understand but aren’t overwhelmed by the information.
I hope this answers your questions and you get your baby spayed before you have any unwanted puppies.
Have you taken her to see a vet? It could be allergies, it could be mange, or it could be related to other conditions. Sarcoptic mange is more prevalent this time of year as the fox move around and look for new territories (if you are in the country). It makes the dogs very itchy but is easy to cure with the advice of your vet and Revolution (the vet has to help you get the timing of the applications right).
Allergies are harder to deal with because it take much more effort to figure out what she is reacting to, and to heal her skin. The first step is to get her on a grain-free diet — and that includes all treats! Grains in her diet will slow down the process of dealing with allergies.
The only way to figure out what is going on with her is to see the vet.
To help with the itching try rinsing her with 1/3 vinegar & 2/3 water. Be sure it gets into her skin, and then allow it to dry. You can try witchhazel with aloe on the raw patches — pat it on with cotton and allow to dry.
And last of all, use the generic form of Zyrtec (not Benadryl) to help get her through a few days of itchiness.
PK