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Hello, my name isXXXXX am a licensed veterinarian and I will try and help you as best as I can.
I am sorry to hear Zaid is not doing well. Did he respond to antibiotics in the past? When was he last on antibiotics? Has he had a urinalysis (urine check) since the most recent urinary problem began?
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I see. x-rays were looking for potential urinary stones, however it appears there are none. chronic use of steroids does often cause urinary tract infections as it suppresses the immune system. The culture is typically done to look for these infections, however can often come back negative. The next step in diagnosis would be an ultrasound, looking mainly for a bladder tumor. It is most likely this is an infection which should resolve with another douse of antibiotics, however if there is no change on the antibiotics, he will need the ultrasound
If these infections continue in the future, the steroid dose will need to be lowered or he will need to be put on another medication like cyclosporine to control the skin problems
Long term high steroid use can lead some dogs to develop Cushing's disease, which causes a worsening of skin. The steroids can also cause diabetes. Schnauzers in particular are predisposed to both diseases, so it would be best to get him off the steroids if possible
I see. what type crystals were present?
There are some stones that cannot be seen on x-rays, however they are pretty uncommon and often are seen only in specific breeds or with certain diseases, which does not fit Zaid
there are 3 things that will cause blood in the urine in a male dog: urinary stones, infection, or a tumor. An ultrasound would rule out any question of stones that were not visible on x-ray and would also rule out a tumor.
Blood dropping without urine is most commonly going to be due to infection or a stone/tumor closer to the end of the penis. Make sure your vet x-rayed the entire penis as well as some vets can miss stones along the urethra if they are only looking at the bladder
unfortunately, I think ultrasound is your best bet right now for a diagnosis based on everything you have told me
You're welcome. Veterinary care can get quite expensive, especially without pet insurance, and especially in the boston area where vet costs can be twice as much as the midwest or south. One thing i would try is looking at CareCredit. it is a health care credit card that is accepted by many vets and does a 90 day same as cash promotion. http://www.carecredit.com/vetmed/