Posted : 4/7/2011 10:19:06 PM
There are lots of things (some treatable) that can cause the BUN to be off. If the BUN gets over 80 you need to have him on a high-quality protein diet with low phosphorus. Absolutely do not put him on a low protein diet. That treatment for renal problems has been debunked. Protein does not cause/worsen renal problems, but failing kidneys have trouble processing phosphorus, so the dog is more comfortable on a low phosphorus diet.
BUN (Blood Urea Nitrogen)
There are other blood levels that can be used to determine possible renal disease, but generally these are the first three blood levels to become elevated. Renal disease can be caused by many factors, including genetics (malformed kidneys), tick borne disease, leptospirosis, chronic urinary tract infections, NSAIDs and other drugs or poison insults. It is important to get a good diagnosis from your veterinarian and to understand if the problem is acute (treatable) or chronic.
Simple diet adjustments can be helpful for dogs with renal problems, especially when the BUN is over 80 and creatinine is over 2 or 3. Two simple diet adjustments that can be very beneficial are providing moist foods and foods lower in phosphorus. Moist foods will help keep the dog's body from pulling other body fluids to the digestive tract to help digest the food. Additionally, dogs with impaired kidneys have trouble processing phosphorus, so feeding foods with reduced or lower levels of phosphorus helps reduce the strain on the kidneys. For more diet information for dogs with kidney disease, see the link below: