Anorexia in pets

What It Is

In animals, anorexia describes reduced or absent appetite rather than the psychiatric eating disorder the same word refers to in people; there is no self-image component involved, only a physical or behavioral reason the animal is not eating. Partial anorexia means the pet eats less than usual, while complete anorexia means it refuses food entirely. Because appetite depends on so many body systems, a drop in food intake is one of the most common and least specific signs seen in any species, from dogs and cats to rabbits, birds, and reptiles.

Common Causes

Pain anywhere in the body, dental disease, nausea, fever, and infections all suppress appetite. Stress from a new home, a hospital stay, or a change in routine can shut down eating temporarily, particularly in cats. Kidney disease, liver disease, cancer, and gut disorders are common underlying causes in older pets, while a change in food, water source, or feeding location may explain shorter episodes in an otherwise healthy animal.

When It Is an Emergency

A cat that stops eating for more than a day or two is at real risk of a serious liver condition called hepatic lipidosis, so feline anorexia should never be left to resolve on its own. Rabbits and guinea pigs that stop eating can develop a dangerous slowdown of the gut within hours and need same-day care. Loss of appetite alongside vomiting, weight loss, lethargy, or breathing difficulty in any species points toward a problem serious enough to see a vet promptly.

What the Vet Will Do

A thorough physical exam, including the mouth and teeth, usually comes first, followed by bloodwork to screen for organ disease, infection, or metabolic problems. Imaging may follow if the exam or bloodwork points to a specific area. In small mammals and birds, the vet will often start supportive feeding quickly rather than waiting for a full diagnosis, since these species deteriorate fast without food.

Home Care and Prevention

Warming food slightly, offering a stronger-smelling option, or hand-feeding small amounts can tempt a pet through a brief, mild dip in appetite. Keep feeding routines and food brands consistent where possible, since sudden changes put some pets off eating. Any pet, and especially any cat, rabbit, or small rodent, that goes without food for more than a day should be seen by a vet rather than coaxed indefinitely at home.