Reptile not eating
Reptiles skip meals for boring reasons and for serious ones. A leopard gecko who pauses for a week in winter while holding a fat tail is not the same patient as a bearded dragon who is losing weight with sunken eyes. Husbandry is the first question. It is not the only question.
Measure before you guess
Write down the hot-side and cool-side temperatures from a thermometer at animal level, and the humidity. Hands are a bad thermometer. Many "anorexia" cases are a basking spot that never reaches the range that species needs to digest. UVB bulbs expire before they look dim. A coil bulb on the wrong side of glass may be doing nothing. Correct a clear husbandry miss, then watch appetite and weight. If you do not know the target range, use the species profile on this site and a reptile veterinarian, not a forum average.
Weigh the animal on a gram scale. A snake or lizard who refuses food and is also losing weight is sick until proven otherwise. A fat tail on a leopard gecko is a fuel tank. A stick tail is a warning associated with chronic infection, including cryptosporidiosis, and it needs a clinic that sees reptiles. The Association of Reptile and Amphibian Veterinarians explains how to find one at arav.org.
Species patterns
Ball pythons are famous for fasting, especially in winter, and some healthy adults pause for weeks. That reputation causes people to ignore a thin snake, a respiratory whistle, or mites. A fast plus weight loss, bubbles at the nose, or stuck shed in a dry rack is a veterinary problem. Corn snakes who are otherwise bright rarely fast for long. A bearded dragon who stops eating and sits in one corner may be cold, impacted, or dealing with parasites or metabolic bone disease. Soft jaw and trembling limbs are an emergency pattern for calcium and lighting failure.
Amphibians who stop eating often have a water-quality or temperature problem, or chytrid-type illness in new animals. Quarantine new arrivals. Do not soak a dehydrated frog in a random electrolyte recipe from the internet. A short shallow soak in dechlorinated water at the right temperature is the usual first aid while you travel, and only if the animal can hold its head up.
Red flags
- Weight loss you can measure, a thinning tail, or sunken eyes.
- Open-mouth breathing, discharge from the nose, or a wheeze.
- Straining, a prolapse from the vent, or a lump that is growing.
- No stool with a firm belly after a large meal, especially on loose substrate.
- Tremors, a rubbery jaw, or inability to lift the body.
The checker groups these as urgent or soon. Species care notes start at the reptile directory and the vet help hub.
Sources
Clinic decisions belong to the veterinarian who can examine the animal. This page is background reading.
Reptile appetite questions
When is a reptile fast an emergency?
Weight loss, a thinning tail, sunken eyes, discharge, or a snake who refuses food and is losing body condition should be seen by a reptile veterinarian.
Should I just warm the tank?
Check temperatures with a thermometer, not your hand. Correct the gradient if it is wrong, and still call a vet if the animal is losing weight.
Is brumation safe to assume?
Only if the animal is a healthy adult of a species that actually brumates, the setup is correct, and weight is stable. Sick reptiles get labeled as brumating too often.