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I need to ask for some additional information. Once I receive your responses, it will likely take 30-40 minutes to type my response. I hope you can be patient.
Are you sure this bloody mucous came from the vulva?
How old is the male dog?
Where did you get the female from?
Does she have diarrreah?
How long have you had her?
Did the vet tell you how old she was approximately or someone else?
Thanks for that last bit of information. Since there is the start of swelling, it is likely she is a little older than you thought and in heat.
Most vets rely on the owner to let them know the pups age. If asked to verify age, they would check the teeth to get a general idea of how old the pup is but at certain times, it can be difficult to determine the pups age. You can read about this here:
If the vet was not asked to verify age, he would assume the age given was correct unless there was clear evidence otherwise. So it is likely she is either a little older than you were told or she is entering estrus early. Though there is a third possibility. Since the urethra is so close to the vulva, it may have come from there as well.
Let me go over the heat cycle just in case you are not fully informed on it. Female Dogs go into heat at any time between 6-12 months usually. The average heat cycle for a dog is approximately 3 weeks but for some dogs it is longer and for others it is shorter. Some as short as 10 days and some as long as 4 weeks or more. Usually your dog will go into heat every 6-7 months though again each dog is different and can go back into heat as early as 4 months or not for 12 months. Most however are average.
During the first part of a dogs heat period you will notice swelling of the vulva, possibly an increase in urination and bleeding. If there are male dogs around you will notice them hanging around her. This stage generally last about 7 days and she will not allow males to mate with her during this period
The second part of the heat cycle is when she will accept a male and breed. Usually a female will lift her tail out of the way. Usually bleeding has stopped or become straw colored at this point. This can last from 4 to 21 days though the average is 7 days. Many expert say the 9-10th day of heat is the optimum day for breeding. It is during this period of time that you will want to allow mating if you wish puppies which I'm assuming you do not want to do.
During the last stage of heat she will be less willing to breed as she is going out of heat. This stage can again last from 4 to 21 days as well but averages 7 days. Each dog is different so some evaluation by the owner is necessary. The whole heat period should be approximately 21 days but as stated can be longer or shorter depending on the dog. Here is an excellent website with pictures to illustrate a female in different stages of heat.
Now a urinary tract infection can produce some blood tinged mucous as well. You would usually notice other symptoms such as increased urination and excessive thirst, but a dog going into heat might have these same symptoms as well. You can usually discover the source of the blood by taking a white napkin and opening the vulva slightly and blotting the area. Depending on where the blood is on the napkin should enable you to determine if there is blood from the vulva or the urethra.
It is more likely to be that she is in heat. I hope this information is helpful to you and you are satisfied. If you would like any additional information or have more questions please don’t hesitate to press the reply to expert or continue conversation button so I can address any issues you still have .
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Since there have been recalls on certain foods, please check the following site to be sure the food your animals eat is not affected. If it is affected, contact your vet as soon as possible. Have your dog seen if they have any symptoms. http://www.fda.gov/AnimalVeterinary/SafetyHealth/RecallsWithdrawals/