If there are no male dogs around, the first physical signs of heat are the enlarging of the vulva. She will start to lick herself more also. You may also see a very light strawberry color discharge depending on how clean she keeps herself. I've known some dogs who never show any discharge because they are obsessed with keeping clean. If there is a male around, he will become crazy and will start sniffing her as early as 3 weeks before you notice any physical signs.

How old is Visa and when was her last heat? There is no set amount of time between cycles just because of the breed. I know some dogs that come into season every 5 months or so and others that come into season every 9 to 12 months. Their age when they first have a heat cycle can be an indication of how frequent they will have a heat cycle.

You mentioned you are going to breed her but don't have all your clearances yet. Then I would STRONGLY discourage you from breeding her for this cycle. A reputable breeder will ALWAYS make sure all the T's are crossed and the I's are dotted before breeding and getting clearances should be done before even determining what Stud dog to use. For instance if Visa gets her OFA (hips) clearance as a fair or good rating, you might want to consider finding a male with and excellent rating. If hers are excellent you will want to find one with Good. Breeding two excellents is discouraged too because the hips can actually be too tight in the offspring. In large breed dogs, even though fair is an ok rating, I do not consider it an option. Smaller breeds are a different story.

Then you need to consider heart clearances and eye clearances. What if the heart clearance shows Visa has a heart murmur? Letting her get pregnant under those conditions could put her life in jeopardy.

Being a reputable breeder means you have to do a lot of homework up front in order to produce the best of the breed you are involved with. It means you are breeding for the right reasons and not because you expect to get money out of selling the pups. If done correctly, having a litter of pups is basically a break even proposition for the first litter after all medical costs and proper care of the newborns are done.

I mention all this because you sound like you want to do it right. If that is the case and she is coming into season, then wait until her next cycle. When I bred Dixie, she was 3 1/2 years old and had several heats so I was able to determine exactly what her cycle was. I actually had it pinned to 3 days of her actually coming into season. Her cycles were 6 1/2 months apart from each other. Knowing when they come in exactly is also critical in breeding because it's normally between the 12 and 15 day they concieve.

Again, if she is coming into season and you're not ready, wait until her next season when you are ready. Do your homework first. There are enough backyard breeders out there and you don't need to be added to that list. The welfare of Visa's future pups depends on you!