Symptoms of oral thrush. A symptom is something the patient feels and reports, while a sign is something other people, such as the doctor detect. For example, pain may be a symptom while a rash may be a sign.
Bleeding Stage. The estrus cycle has four stages. The first stage is called proestrus. This lasts approximately 10 days and it is during this stage that your dog will bleed from the vaginal area. This is your dog's preparation for pregnancy phase, but she will not want to mate with a male during this time.
General Rules of Thumb for Canine Estrus. 1  The first estrus cycle usually occurs by age 6-12 months; for some small breeds, as early as 5 months, and for some large and giant breeds, the first cycle may not occur until 14 months of age or older. 2  On average, dogs have two cycles a year. The estrus cycle lasts on average 12-21 days, but maybe be as short as a few days to four weeks. The estrus period length varies widely between breeds and individual dogs. The length of a cycle varies widely, even for dogs of the same breed.