October 2026
Maybe your ferret's tail has started to look thin and patchy. Or maybe you've caught them staring blankly into space for a few seconds before snapping back to normal. Both are worth a closer look. As ferrets reach middle age, two hormone-related diseases become very common: adrenal disease and insulinoma. Many ferrets develop one, and some develop both. Knowing the signs helps you act early.
The adrenal glands are two small glands near the kidneys. In ferrets with adrenal disease, one or both glands become enlarged, through overgrowth or a tumor, and produce too many sex hormones.
The most familiar sign is hair loss that often starts at the tail and spreads over the hips, back and sides. Many ferrets are itchy. Spayed females may develop a swollen vulva, and some ferrets show a return of mating behavior, more aggression or a stronger musky odor.
Males need special attention. An enlarged prostate can make it hard to urinate, and a male ferret who is straining and producing little or no urine needs to be seen right away.
Treatment depends on your ferret's age and health and on which gland is affected. Hormone implants can calm the overactive glands and control the signs. They manage the disease rather than cure it, and they need to be repeated over time. For some ferrets, surgery to remove an affected adrenal gland is the better choice, and I perform adrenal surgery in ferrets at Priest Lake Veterinary Hospital.
Insulinomas are tumors of the pancreas that release too much insulin, which drives blood sugar too low. It's essentially the opposite of diabetes, and it's one of the most common diseases in middle-aged and older ferrets.
Low blood sugar can look like lethargy, staring into space, a "spaced out" expression, weakness or wobbling in the back legs, drooling, or pawing at the mouth as if nauseated. Severe episodes can lead to collapse or seizures. Signs often come and go, and they tend to appear after exercise or a long stretch without food. Some of these signs overlap with stomach and intestinal problems, which are also common in ferrets, so a good exam is how we sort it out.
We start by checking blood sugar. My colleagues and I published a study showing that portable glucometers don't reliably identify low blood sugar in ferrets, so I like to confirm low or borderline readings with laboratory testing before making big decisions. Ultrasound can help look for tumors.
Depending on the ferret, treatment may involve surgery to remove pancreatic tumors, medication to help keep blood sugar up with regular monitoring, and diet management with frequent small meals of a high-protein ferret diet and no sugary treats. With good management, many ferrets with insulinoma enjoy a good quality of life for some time.
If your ferret is weak or wobbly but awake, call the clinic. Your vet may advise rubbing a small amount of honey or syrup on the gums and offering their normal food once they're alert. Never put anything in the mouth of a ferret that is seizing or unconscious. Get emergency help right away.
Ferrets are true carnivores with a very short digestive tract. They do best on a diet built on high-quality animal protein and fat, with very little fiber or sugar. Diets heavy in plant protein have been linked to bladder stones, and I generally don't recommend raw diets because of the risk of bacterial infections.
There's no guaranteed prevention. What helps most is catching problems early: a yearly wellness exam, a high-quality ferret diet without sugary treats, and attention to small changes at home. Ferrets show discomfort more openly than rabbits or guinea pigs, but it's still easy to mistake for personality. Less play, more hiding, squinting, or not curling up to sleep are all worth mentioning.
Call immediately if your ferret collapses, has a seizure or can't be roused, or is straining to urinate and producing little or no urine. Please call before you put a weak or collapsed ferret in the car.
Book a prompt visit if your ferret is losing hair, is itchy or has a swollen vulva, has episodes of staring, weakness or drooling, or is less active or eating less.
Dr. Logan Kopp, DVM, DABVP (Exotic Companion Mammal Practice), is Nashville's ferret specialist and sees ferrets with adrenal disease, insulinoma and gastrointestinal problems, including surgical cases, at Priest Lake Veterinary Hospital. Call (615) 361-4646. After hours, contact Veterinary Emergency Group in Franklin, Murfreesboro or West Nashville.
This article is general information, not medical advice for your pet. Reading it doesn't create a veterinarian-client-patient relationship (VCPR). Please talk with your own veterinarian before making changes to your pet's care.