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If the urine is so dark to be almost brown, it may indicate blood in the urine. Your girl likely has a urinary tract infection. 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 she can get medication for the problem since she is already displaying possible blood in the urine and a strong odor to the urine.
I am assuming you have checked to be sure she is not in heat. Signs of heat would be a swollen vulva and male dogs being drawn to her. Since it is Saturday, you might try and have the vet take a quick look. Generally if a dog is eating and drinking and eliminating a UTI isn't an emergency unless the dog is unable to urinate at all.
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