Ferret Care Guide

Ferrets are domesticated members of the weasel family (VCA): small, long-bodied carnivores that play hard in short bursts and sleep up to 18 hours a day (Merck). They need a meat-based diet, a ferret-proofed room and a vet who knows ferrets, because insulinoma and adrenal disease are common in middle age. Check the law first: California prohibits ferrets as pets and does not issue permits to keep one (California Department of Fish and Wildlife).

Care requirements

Need	What to provide
Enclosure	Wire cage at least 3 × 3 × 2 ft (91 × 91 × 61 cm) with a solid or padded floor, a hammock or sleep sack, and a litter tray, plus 2–4 hours a day outside it (Merck)
Temperature	65–75°F (18–23°C) is comfortable; keep below 90°F (32°C). Ferrets don’t sweat (Merck; VCA)
Humidity	Keep the cage dry and away from damp; heat plus humidity is dangerous (Merck)
Lighting	No special lighting. Don’t put the cage directly in front of a window (Merck)
Diet	Commercial ferret kibble: high in animal protein, moderate fat, low carbohydrate, available at all times. Treats under 5% of daily calories (Merck)
Lifespan	Typically 6–10 years (Merck)
Social needs	Plan on more than one. Groups of up to four, ideally littermates, all neutered (RSPCA)
Legal notes	Prohibited as pets in California, where no pet permits are issued; check state and city rules elsewhere (California Department of Fish and Wildlife)

Hob vs jill

	Male (hob)	Female (jill)
Adult weight	Up to 4 lb (2 kg) (Merck)	Up to 2.5 lb (1.2 kg) (Merck)
If left entire	Stronger musky smell; more likely to be aggressive in a group (Merck; RSPCA)	Can stay in heat indefinitely, and the high oestrogen can cause life-threatening aplastic anaemia (VCA)
Neutering	Recommended for all pets in a group (RSPCA)	VCA advises spaying at 4–6 months unless she will be bred every season
Adrenal disease signs	Prostate swelling (VCA)	Swollen vulva (VCA)

Feeding a carnivore

Ferrets have a high metabolism and a short gut, so they need to eat little and often, with food and water available all the time (Merck). Merck’s guidance is a commercial ferret food that is low in carbohydrate, moderate in fat and high in protein, with meat as the main ingredient. Dry kibble is preferred, because a long-term soft, wet diet leads to gum and tooth disease. Diets heavy in plant protein can cause bladder stones (Merck).

Sugar matters more for ferrets than for most pets. Ferrets are very prone to insulinoma, a pancreatic tumour that releases too much insulin and drives blood sugar down. Merck says sugary foods such as honey, raisins and fruit make the pancreas release more insulin and may worsen the signs. Dairy and starchy foods are also poorly digested. Good treats are small pieces of meat, egg, or freeze-dried muscle or organ meat sold as cat or dog treats. Keep treats under 5% of daily calories (Merck).

Merck also recommends getting your ferret used to a soft, meat-based food while it is healthy. Sick ferrets often need syringe feeding, and one that has never tasted soft food may refuse it.

Insulinoma, adrenal disease and distemper

These three account for much of ferret veterinary care.

• Insulinoma. VCA says ferrets over three years old that are chronically lethargic, hard to wake or unsteady on their back legs may have low blood sugar. Severe cases have seizures. It can’t be cured, but VCA reports that with lifelong treatment many ferrets live normally for up to two and a half years after diagnosis.
• Adrenal gland disease. VCA calls it possibly the most common disease of ferrets. Signs are hair loss on the tail, rump or back, itching with no fleas or mites, and a swollen vulva or prostate. A hormone implant can prevent it or reverse mild cases. Advanced cases need surgery (VCA).
• Canine distemper. It is usually fatal in ferrets. Infected ferrets usually die within one to two weeks, and VCA says every ferret at risk of exposure should be vaccinated. Signs include thick eye and nose discharge, fever, a rash on the chin or belly, and hard, thickened footpads.

Merck notes that ferrets smell less musky if neutered early, and that the anal scent glands are usually removed at the same time. Many ferrets have had both surgeries before sale. Ask the seller exactly what has been done.

Ferret-proofing and play

Merck recommends at least 2–4 hours out of the cage every day, either supervised or in a ferret-proofed area. Ferrets are fearless, have short attention spans and test everything with their mouths. They squeeze into recliners, behind appliances and into wall gaps. Before the first free run, block gaps behind and under furniture and appliances, lift cables out of reach, and check what is chewable at floor level. Ferrets have no homing instinct and will wander off if they get outside (Merck).

Expect sudden bursts of energy: Merck says ferrets let out of a cage may run, leap, twist and crash into things, and this is normal, healthy behaviour.

Gotchas

• Fruit, raisins and cereal treats. Plenty of pet-shop treats contain them, and they are the wrong food for a carnivore prone to insulinoma (Merck).
• Assuming cat food is fine. Merck notes that dedicated ferret diets now meet ferrets’ needs better than cat or kitten food.
• An unspayed jill. Left in heat, she can develop aplastic anaemia, which is serious and expensive to treat (VCA).
• A hot room. Ferrets can’t sweat. Heatstroke shows as open-mouth breathing and is an emergency (VCA).
• Human medicines. VCA warns that common human drugs can easily poison or kill ferrets.

Avoid

• Sugary foods: fruit, raisins, honey, sweet treats (Merck)
• Milk and other dairy; bread, cereal and other high-carbohydrate foods (Merck)
• Clumping cat litter, which can cause breathing problems (Merck)
• Cedar bedding, newspaper and wood chips (Merck)
• Fabric that unravels or that your ferret chews and swallows (Merck)
• Rooms above 90°F (32°C) or in direct sun (VCA; Merck)
• Over-the-counter or prescription human medicines (VCA)

Signs to see a vet

Get help the same day for a ferret over about three years old that is weak, hard to wake, unsteady on its back legs or having a seizure (VCA). Heatstroke (open-mouth breathing in a warm room) and suspected distemper are emergencies (VCA). Book a prompt appointment for hair loss on the tail or rump, a swollen vulva, or a jill that stays in heat (VCA).