TL;DR: A dog's loss of appetite is usually not an emergency unless it lasts over 24 hours or involves puppies or senior dogs. Capturing photos of gums or videos of feeding attempts can help your vet quickly determine if the cause is medical or behavioral.
What does it mean if my dog has a decreased appetite?
A decreased appetite, medically referred to as hyporexia (eating less) or anorexia (refusing to eat), occurs when your dog shows a lack of interest in their usual meals. This can be a subtle change where they skip a meal or a complete refusal of all food. It is often a primary indicator that something in your dog's body or environment isn't quite right.
Is a lack of appetite in my dog considered a medical emergency?
- The urgency level is generally considered low if your dog is still drinking water, remains alert, and is not showing other severe symptoms.
- Most healthy adult dogs can miss a single meal without immediate danger.
- You should schedule a veterinary consultation if the lack of appetite persists for more than 24 hours.
- Immediate attention is needed if the lack of appetite affects puppies or senior dogs, or if it is accompanied by repeated vomiting or extreme lethargy.
How can a photo or video help my vet triage my dog's condition?
- Take a photo of your dog's gums to help the vet check for signs of anemia or circulation issues.
- Record a video of your dog sniffing food and turning away to help a professional determine if the cause is nausea, dental pain, or a behavioral issue.
- Capture a clear photo of any abnormal stools to provide vital clues about your dog's digestive health.
Clinical Context (Merck Veterinary Manual)
Anorexia, either partial or complete, can accompany many underlying disorders, including drug reactions or reactions to environmental changes. Pain is a significant contributor to anorexia, and learned food aversions can also play a role, often occurring when animals are started on therapeutic diets while ill or as a result of force-feeding. Partial anorexia in dogs is defined as consuming less than 30 kcal/kg body weight daily. If a dog continues to lose weight and condition, tube feeding or parenteral nutritional support should be considered.
Chapter: Gastroenterology
Source: The Merck Veterinary Manual, 11th Edition (Page 2381)