My senior dog has stopped eating — when to worry, when to act
A senior dog refusing food once or twice is not necessarily clinical. A senior dog refusing food consistently for 48-72 hours is. Below: a decision tree by hour count, the difference between picky and clinical, and what this often means in the context of progressive disease.
The Quality-of-Life Decision Pack
A weekly tracker, the eight questions, and the family conversation script.
The short answer
24 hours of refusing food in an otherwise well dog: monitor. 48 hours: vet appointment within the day. 72 hours: same-day clinical workup, especially in a senior dog or one with known chronic disease.
The 24/48/72-hour decision tree
- 0-24 hours. Offer favourite foods, warmed. Hand-feed if necessary. Many transient appetite drops resolve here.
- 24-48 hours. Time for a vet appointment within the day if your dog is older than 8, has known disease, has recently changed medication, or has any other clinical signs (vomiting, lethargy, restlessness).
- 48-72 hours. Same-day vet review. By this point, persistent anorexia in a senior dog warrants a structured workup — bloodwork, urinalysis, abdominal palpation, sometimes imaging.
- > 72 hours. If your dog has been refusing food for three days, the question of underlying cause is no longer optional. Either the cause has been identified and managed, or it has not — and the latter is unsustainable.
Picky vs clinical — how to tell the difference
- Picky: refuses kibble, accepts chicken. Refuses morning meal, eats evening meal. Eats small amounts when hand-fed. Otherwise normal in behaviour.
- Clinical: refuses everything offered, including favourites. Walks away from food after sniffing. Drools or retches when food is presented. Other signs present (lethargy, hiding, breathing changes).
The most useful single test: does the dog eat in front of you, when you stay calm and offer something they have always loved? If no, this is clinical, not picky.
Water matters more than food
A dog who is refusing food but drinking normally has not yet crossed into the most concerning territory. A dog who refuses water for more than 24 hours has — that is dehydration acceleration, and it is a signal to act today.
Other water-related red flags: drinking excessively (more than 100 ml/kg/day in dogs not on diuretics) is its own clinical signal — for diabetes, kidney disease, Cushing\u2019s, or hypercalcaemia. Track it.
In senior dogs specifically
Persistent anorexia in a senior dog, in the context of known chronic disease, has a specific meaning. The most common underlying drivers we see in consultation:
- Chronic kidney disease. Uraemic nausea suppresses appetite. Mirtazapine and anti-emetic therapy can rescue it for weeks.
- Cancer (mixed types). Cachexia is a presenting feature of many advanced cancers.
- Cardiac disease. Late-stage CHF reduces appetite as effort itself becomes too much.
- Cognitive dysfunction. Demented dogs sometimes forget to eat, or refuse food in unfamiliar bowls.
- Dental pain. Frequently overlooked in seniors. A bad tooth can stop a dog eating in a day.
When persistent anorexia becomes the conversation
For a senior dog with known progressive disease, persistent anorexia despite appetite stimulants and treatment of the underlying condition is the welfare threshold for the euthanasia conversation. It is not the only threshold, but it is one of the clearest.
See the HHHHHMM scoring rubric for the structured framework. The Hunger axis at 3 or below for more than a week, combined with any other axis below 5, is overdue for the conversation.
Common questions
How long can a dog go without food?
Should I force-feed my dog?
My dog drinks but won’t eat. Is that better?
Should I try a special diet?
Editorial reference, not veterinary advice. — Dr. NRS, last reviewed 27 April 2026.