Calcitriol Reference for Veterinarians and Cat Owners!. This web site provides information for veterinarians and pet owners considering the use of calcitriol to treat dogs and cats with chronic renal failure (CRF). Feline Chronic Kidney Disease - Tanya's Comprehensive Guide - Symptoms, Diagnosis, Nutrition, Treatments and How To Cope With It Calcitriol. Calcitriol is a relatively recent and somewhat controversial method for controlling calcium and phosphorus levels and hyperparathyroidism (high levels of the parathyroid hormone, or PTH, which is common with kidney disease). This section discusses treatments relating to fluid issues, such as dehydration and overhydration, constipation and diarrhoea. It also covers treatments for urinary issues, including incontinence and inappropriate elimination (urinating outside the litter box). Calcitriol-a treatment for chronic kidney failure in your cat or dog. Calcitriol as the active form of Vitamin D is actually a hormone over 1,000 times as potent as natural or synthetic vitamin D itself. Kidney Disease In Your Dog Chronic Renal Problems Chronic Renal Failure (CRF), Chronic Renal Insufficiency (CRI).