My westy terrier was spayed is 4 year's old and has been spayed 2 years ago. before few month's I noticed little blood from her vulva. and it's not stopped from then. i took her to a vet, urine is ok, x-rays ok. vet was confused but he gave shots of antibiotics jus for sure. but nothing helped. dog is acting normally. eating, drinking, peiing ok. but few drops of blood every day. i'm scared and confused.