Yes, the rule of thumb has been ten days in ten days out which unfortunately means ,she could be in heat for awhile before showing any real signs such as bleeding . Mainly before she starts to bleed she might move her tail to the side or want to go outside a lot she also may lick her self a lot like she's cleaning but usually her area will be swollen , when she starts to bleed you might see little drops of blood on the floor or her bedding or lets hope not on your furniture, your local pet store will have little dog pads for her that you can use to keep blood off your stuff , however some dogs are not receptive to the pad thing so you might have to try something different like a diaper or old under ware with a hole cut out for her tail in the mean time if you don't want pups keep a close eye on her and by all means get her spayed f.y.I. It cost more to have her spayed when she's in heat and it will cost you more if she's already with pups . Be good to her ,be a responsible pet owner if you don't want puppies.
