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To find out where the spotting might be coming from, you can take a white cloth or tissue and blot the urethra at the top of the vulva first and then the vagina area and see where the blood is coming from. If it is not coming from either of those places then blot the area around the rectum as anal glands are located their.
If it is coming from the urethra, then a urinary tract infection is a good possibility. However, you don't indicate additional symptoms of a UTI. Common symptoms of a urinary tract infection are frequent urination, dribbling urine, blood in the urine, squatting frequently to urinate, strong odor to the urine, inappropriate urination and straining to urinate as well as an increase in fluid intake. A dog with a UTI does not always show all the symptoms and typically displays 2 or 3. I believe you need to have your Vet check your dog out so it can get medication for the problem if your dog is displaying 2 or more of the above symptoms..
If there is bleeding from the vulva then a uterine infection might be a possibility. Sometimes a small amoutn of reproductive tissue is left behind after a spay operation. That small amount of tissue can become infected and lead to bleeding and even discharges of pus. this is called stump pyometra and you can read about this here:
Now a dog's anal glands can become infected and bleed as a result. The anal glands are 2 sacs on either side of the anus at about the 4' o'clock and 8 o'clock positions. Dogs with continued anal glands or overfilled anal glands can develop infections in the area which can lead to a discharge of pus or blood from the glands. Keeping the glands emptied regularly can help prevent this but if it is already infected, your vet is the best one to take care of it as he can flush the gland and prescribe antibiotics to treat the infection. Excellent site on anal glands
Of course tumors in these areas can also lead to spotting as well. I would recommend having her seen by your vet as soon as possible since some of these conditions can be life threatening if not treated. Locating the source of the spotting would be the first step in determining the cause though.
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