urgent!5 months old rabbit has urine as clear as water and fur lose near genitals..plz help

Question
Hi
My 5 months old Black urinates as clear as water.  Pees a little more than before and i have noticed fur loss in inside of his leg and genitals. He also had his hind quarters wet sometimes. I saw this change a fortnight ago and consulted a doctor on the second day, who said this is normal.  
So what I did from my end is, I increased his water intake and have seen this helps to keep his hindquarters dry.
I feed him hay, green leaves and water in plenty. Give him few slices of papaya every day and bananas, carrots once or twice a week. I also clean his cage daily.
Now yesterday his partner expired and since then he kept quite. And at night, he seemed to suddenly lose his body control. His head went under his chest and legs got flat. But he resumed his normal posture within two minutes.
He had developed a hind leg paralysis when he was 3 weeks old and the doctor then had prescribed Septran syrup and Neurobian Forte. Is  his urine symptom and a sudden lose of body control  indicate some danger?
I am from India and vet hospitals ( especially for rabbits) are not so good or have any updated equipments for blood tests or ultra sound.
So please help ASAP. I have lost one 3 months female yesterday. I dont want to lose any more.

Answer
Dear Indrani,

Fur loss around the genitals and back legs is NOT normal, and in concert with the clear urine and excessive drinking, this suggests renal failure.  In a rabbit this young, it is not likely a chronic condition.  And if his companion has just died, I have to wonder if the bunnies were exposed to some toxin that has damaged their kidneys.

Bloodwork to check B.U.N. (Blood Urea Nitrogen), creatinine, and other values would help ascertain the state of the kidneys.  But subcutaneous fluid therapy would help flush toxins from the bunny's bloodstream and help stabilize him right now.  Any vet, even one not familiar with rabbits, should know how to treat acute renal failure.

Bloodwork might also reveal evidence of toxicity.  But if you know that the bunnies might have been exposed to any type of poison--cleaning product, pesticide, fertilizer, etc.--you must remove it immediately.  Rabbits are extremely sensitive to such things.

These bunnies are too young to be likely candidates for anything but some environmental problem that has caused these problems, so the detective work must start now.  I hope your surviving bunny will be okay.  The depression caused by the loss of his mate must also be treated with extra love and attention until he is well again.

I hope this helps.

Dana