A rabbit, guinea pig or bird suddenly stops eating and moving — does it need a vet right away?

A rabbit, guinea pig or bird suddenly stops eating and moving — does it need a vet right away?

Identify the species first. The same symptom is handled differently in different species, and copying another species' handling can do harm. Covered here: rabbits and guinea pigs; rabbits, guinea pigs and chinchillas; poultry; reptiles and amphibians; farm animals and horses; horses; fish and invertebrates; birds.

Applies to all species

Signs: Refusing food beyond the safe threshold for that species (the threshold varies enormously between species

Signs: Rabbits (GI stasis, one of the most common life-threatening signs in lagomorphs), cats (megacolon), reptiles (obstruction or calcium deficiency)

• ❗ [Applies across species] No direct source for handling this species was found at this level. Do not copy what is done for other species — contact a veterinarian familiar with this species right away.

Signs: Cats (the upper respiratory infection group; stress readily triggers herpesvirus reactivation), birds, reptiles (respiratory infection)

• ❗ [Applies across species] No direct source for handling this species was found at this level. Do not copy what is done for other species — contact a veterinarian familiar with this species right away.

Signs: Rabbits, guinea pigs, other rodents

• ❗ [Applies across species] No direct source for handling this species was found at this level. Do not copy what is done for other species — contact a veterinarian familiar with this species right away.

Rabbits and guinea pigs

Signs: GI stasis

• [Rabbits and guinea pigs] Seek veterinary care immediately
• [Rabbits and guinea pigs] Do not wait on the assumption that "it may just not be hungry"
• [Rabbits and guinea pigs] Do not syringe-feed anything that has not been directed by a veterinarian

Rabbits, guinea pigs and chinchillas

Signs: 🚨 Rabbits: a drop in appetite or reduced stool output lasting "more than 4 hours" is already a warning sign. Do not wait longer. A named source (University of Illinois College of Veterinary Medicine) states for rabbits: **a rabbit that eats less or passes less stool

• [Rabbits, guinea pigs and chinchillas] Rabbits: a drop in appetite or reduced stool output lasting "more than 4 hours" is already a warning sign; do not wait longer
• [Rabbits, guinea pigs and chinchillas] y Medicine) states for rabbits: a rabbit that eats less or passes less stool for more than 4 hours should be treated as a GI stasis warning sign and taken to a veterinarian
• [Rabbits, guinea pigs and chinchillas] The sooner the better; do not count down against any number

Signs: A drop in appetite or reduced stool output (no precise guinea-pig-specific time to seek care was found in the whitelisted sources, so this project states no number; guinea pigs are hindgut fermenters like rabbits and likewise have no vomiting reflex, so the sooner care is sought the better — do not wait out any number of hours. The 4-hour threshold for rabbits comes from the University of Illinois

• [Rabbits, guinea pigs and chinchillas] Guinea pigs are hindgut fermenters like rabbits and likewise have no vomiting reflex; the sooner care is sought the better, and do not wait out any number of hours

Signs: Staying curled up and not unfolding for an abnormally long time; clearly worsening unsteady gait; ambient temperature too low with suspected dangerous torpor (cold to the touch and slow to respond); refusing food for more than a day (**exact threshold [no single authoritative value for this item: the whitelisted sources give no small-mammal-specific reference value for hours of food refusal; this falls within case-by-case clinical judgment

• [Rabbits, guinea pigs and chinchillas] Staying curled up and not unfolding for an abnormally long time; clearly worsening unsteady gait; ambient temperature too low with suspected dangerous torpor (cold to the touch and slow to respond); refusing food for more than a day (exact threshold [no single authoritative value for this item: the whitelisted sources give no small-mammal-specific reference value for hours of food refusal
• [Rabbits, guinea pigs and chinchillas] This falls within case-by-case clinical judgment and varies greatly between individuals — do not wait according to this number; verified 2026-07-30]

Signs: Sudden hind limb weakness or paralysis (suspected low blood calcium), severe self-inflicted bleeding, continuous convulsions, refusal of food or a marked drop in appetite (no sugar-glider-specific emergency time was found in the whitelisted sources, so this project states no number; this species has a high metabolic rate and tolerates fasting poorly, so the sooner care is sought the better — do not wait out any number of hours; verified 2026-07-30).

• [Rabbits, guinea pigs and chinchillas] This species has a high metabolic rate and tolerates fasting poorly; the sooner care is sought the better, and do not wait out any number of hours; verified 2026-07-30)

Poultry

Signs: Same as the laying hen group (depression, respiratory distress, several birds in the flock falling ill at once, convulsions, bloody droppings, refusal of food, severe lameness); plus: sudden collapse on the back and sudden death (suspected SDS), and marked rapid breathing even at rest (suspected ascites or heart failure) — broiler lines carry a higher risk of these cardiopulmonary emergencies than other chicken types, so seek care immediately if any one appears.

• ❗ [Poultry] No direct source for handling this species was found at this level. Do not copy what is done for other species — contact a veterinarian familiar with this species right away.

Reptiles and amphibians

Signs: High-protein diet (animal protein fed by mistake), dehydration

Signs: Bacterial infection, trauma

• [Reptiles and amphibians] Avoid sharp food items and substrate injuries

Signs: Bacterial infection, trauma

• [Reptiles and amphibians] Keep the enclosure clean and avoid trauma

Signs: Dehydration or a high-protein diet

Signs: Continued refusal of food with marked weight loss or low activity; hind limb weakness or convulsions (suspected severe MBD or a low blood calcium emergency); no droppings for several days with abdominal swelling (suspected intestinal obstruction); marked oral swelling and discharge; large areas of skin ulceration; suspected egg binding; burns caused by a failed heating device — seek care immediately if any one appears.

• ❗ [Reptiles and amphibians] No direct source for handling this species was found at this level. Do not copy what is done for other species — contact a veterinarian familiar with this species right away.

Signs: A highly contagious parasite in the gecko-keeping community

• [Reptiles and amphibians] Quarantine new animals strictly and avoid mixing in animals of unknown origin

Signs: Long-term refusal of food or chronic disease

Signs: Bacterial infection, trauma

Signs: The tail visibly thinning (a warning sign of exhausted fat reserves); continued refusal of food; retained shed on toe tips or eyelids with signs of local necrosis; suspected egg binding; convulsions or hind limb weakness; oral swelling and discharge — seek care immediately if any one appears.

• ❗ [Reptiles and amphibians] No direct source for handling this species was found at this level. Do not copy what is done for other species — contact a veterinarian familiar with this species right away.

Signs: A poorly designed drinking system (a water bowl instead of a dripper or mister) — the leading root cause of illness in chameleons

Signs: Bacterial infection

Signs: Bacterial infection, trauma

• [Reptiles and amphibians] Keep the enclosure clean and avoid trauma

Signs: Long-term refusal of food with continued weight loss

Signs: Audible breathing sounds; mucus or foam at the mouth and nose; long-term refusal of food with marked weight loss; neurological signs (head tilt, inability to right itself, spasms — a warning sign of suspected inclusion body disease); traumatic bleeding; burns; prolapse of the rectum or cloaca — seek care immediately if any one appears.

• ❗ [Reptiles and amphibians] No direct source for handling this species was found at this level. Do not copy what is done for other species — contact a veterinarian familiar with this species right away.

Signs: Bacterial infection, trauma

Signs: Same as the ball python (group F): breathing sounds, discharge at the mouth and nose, long-term refusal of food with weight loss, neurological signs, traumatic bleeding, burns, prolapse; plus: the risk of going missing after an escape combined with long-term lack of food.

• ❗ [Reptiles and amphibians] No direct source for handling this species was found at this level. Do not copy what is done for other species — contact a veterinarian familiar with this species right away.

Signs: Large areas of skin redness or ulceration (suspected red leg disease, which is highly contagious and needs immediate isolation and veterinary care); floating at the surface or lying on the bottom for a long time without responding to stimuli; refusal of food with marked weight loss; signs of chemical burns on the skin (after contact with an unknown liquid); severe swelling — seek care immediately if any one appears.

• [Reptiles and amphibians] Large areas of skin redness or ulceration (suspected red leg disease, which is highly contagious and needs immediate isolation and veterinary care); floating at the surface or lying on the bottom for a long time without responding to stimuli; refusal of food with marked weight loss; signs of chemical burns on the skin (after contact with an unknown liquid); severe swelling — seek care immediately if any one appears

Signs: External gills largely blackened, shrunken or gone (a water quality emergency warning in axolotls); lying on the bottom for a long time without responding to stimuli; large patches of cottony white material on the skin (fungal infection); refusal of food with marked weight loss; severe traumatic bleeding; severely cracked skin in terrestrial species — seek care immediately if any one appears.

• [Reptiles and amphibians] External gills largely blackened, shrunken or gone (a water quality emergency warning in axolotls); lying on the bottom for a long time without responding to stimuli; large patches of cottony white material on the skin (fungal infection); refusal of food with marked weight loss; severe traumatic bleeding; severely cracked skin in terrestrial species — seek care immediately if any one appears

Farm animals and horses

Signs: Long periods with an empty stomach, a diet high in concentrate and low in forage, training or competition stress

• [Farm animals and horses] Offer forage more often, shorten long empty-stomach periods, and reduce stressors

Signs: Viral infection

Signs: Once a donkey's appetite drops or it stops eating for any reason (pain, stress, another illness), body fat is mobilized into the blood faster than the liver can process it, creating a vicious cycle

• [Farm animals and horses] Any drop in appetite in a donkey should be treated as a warning sign calling for prompt veterinary care; do not wait and watch

Signs: Strong bonding with a companion, and loss of that companion

• [Farm animals and horses] Avoid keeping the animal alone long term, and provide a new companion promptly

Signs: Everything listed for horses (A); plus: any drop in appetite or any stoppage of eating beyond a short period counts as an emergency (risk of hyperlipemia), and it must not be delayed by applying the observation standard used for horses; refusal of food after a companion dies also needs prompt veterinary assessment.

• ❗ [Farm animals and horses] No direct source for handling this species was found at this level. Do not copy what is done for other species — contact a veterinarian familiar with this species right away.

Signs: Common in dairy cows after calving; related to changes in rumen volume and negative energy balance

Signs: Multiple pathogens plus transport or environmental stress as triggers

Signs: Negative energy balance after calving

Signs: Negative energy balance in late multiple-fetus pregnancy

Signs: Viral infection, with zoonotic and reassortment risk

• [Farm animals and horses] Biosecurity; avoid close contact when handling sick pigs

Signs: Related to stress and excessive stocking density

Signs: Related to stress and poor dietary management

This content is for education only and cannot replace diagnosis or prescription by a licensed veterinarian. In an emergency, seek veterinary care immediately.

Horses

Signs: Colic

• [Horses] Contact a veterinarian immediately
• [Horses] If it is safe to do so, lead the horse at a slow walk to keep it from rolling and injuring itself (but if the veterinarian says to wait, follow the veterinarian's judgment at the time)
• [Horses] Never give any medication on your own

Fish and invertebrates

Signs: Bacterial septicemia or hemorrhagic septicemia

• [Fish and invertebrates] Avoid stressors (water quality, crowding, trauma) and isolate sick fish early

Birds

Signs: A range of medical and surgical emergencies

• [Birds] Seek veterinary care immediately; do not watch and wait at home

Signs: Neurological signs (twisting of the head and neck, inability to stand and balance), refusal of food, fluffed feathers and standing motionless, traumatic bleeding, respiratory distress — twisting of the head and neck in particular raises strong suspicion of paramyxovirus infection, so seek care immediately and consider isolating the flock.

• ❗ [Birds] No direct source for handling this species was found at this level. Do not copy what is done for other species — contact a veterinarian familiar with this species right away.

Limits of this content

This article reorganizes veterinary encyclopedia material by species into a triage guide, with the source marked on every entry (44 anchors in total; see the evidence chain). The sources listed at the end are the authoritative references cited by the chapters covered here; the correspondence is at chapter level, which does not mean every sentence traces back to that particular source. This content is for education only and cannot replace diagnosis or prescription by a licensed veterinarian. In an emergency, seek veterinary care immediately. Sources are marked entry by entry from the encyclopedia material (see the evidence chain at the end); the text has not been clinically reviewed by a named veterinarian.