Hi,
I'm sorry your shitzu is having problems. Is she spayed? If not, perhaps she's in heat.
If you're sure it's coming from the urethra and not just the vulva blood in the urine is a serious issue that should be addressed quickly. From a western medicine perspective, it is most likely caused by bladder stones. A simple xray and urinalysis by the vet can rule this in/out. Untreated, the infection can ascend up to the kidneys and cause permanent renal problems. The bladder stones can make it so your dog can't urinate. Please monitor her urination carefully. She should be started on antibiotics ASAP -- 4 days is too long to wait. Go to your local emergency clinic for an exam, urinalysis and antibiotics.
From a homeopathic perspective, you can try Pulsatilla 30C from a health food store. Give 10 pellets on her tongue one time. This may or may not work to clear up her problem.
I hope this is helpful. Let me know if you need more information.
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