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Hello, I'm Dr. Deb and will do my best to help you today.
I'm sorry that Berkeley appears to have a urinary tract infection (uti).
She certainly can be given a cranberry supplement which isn't going to be at all harmful but I suspect you know that she'll require antibiotics before complete resolution of the problem is seen..if, indeed, a bladder infection is the problem (which is highly likely given her symptoms). I typically feel that these products are more effective in preventing recurrent episodes but some patient's symptoms appear to be less intense during a uti episode when they're given them during one.
If she's not currently taking steroids or non-steroidal anti-inflammatory medication and isn't vomiting, Aspirin may help with any bladder inflammation that's present. The dose would be 10 mgs per pound of body weight twice a day, with food to avoid stomach upset.
Encourage her to drink water or low sodium chicken/beef broth which can help to flush out the bladder.
I hope this helps. Deb