Dog Fever: How to Tell and What to Do
Quick Answer: Watch and Assess
A normal dog temperature is 101-102.5F (38.3-39.2C). Above 104F (40C) is a fever requiring veterinary attention. Above 106F (41C) is life-threatening.
You can't accurately assess a dog's temperature by feel -- the old "nose test" is a myth. A rectal thermometer gives the only reliable reading.
Most Common Causes
Infection (bacterial, viral, fungal) (common)
The most common cause. The immune system raises body temperature to fight pathogens.
Inflammation (common)
Injury, immune-mediated conditions, pancreatitis.
Vaccination (common)
Low-grade fever for 24-48 hours post-vaccine is normal.
Toxin ingestion (moderate)
Many toxins cause fever as part of systemic response.
Hyperthermia (not true fever) (moderate)
Overheating from environment (hot car, exercise). Not driven by infection but equally dangerous.
Wait, Act, or Emergency?
You Can Watch and Wait If:
- Mild fever (102.5-103.5F) for 24 hours after vaccination
- Dog is alert, drinking, no other concerning symptoms
Call or Visit Your Vet If:
- Temperature above 103.5F (39.7C) with other symptoms
- Fever lasting more than 24 hours
- Puppy or senior dog with any fever
Go to Emergency Vet Immediately If:
- Temperature above 106F (41.1C)
- High temperature with collapse, seizures, or bloody stool/urine
Our interactive checker walks you through symptoms, severity, and duration -- and gives you a clear go/wait/monitor answer.
Frequently Asked Questions
Is Your Dog an American Bulldog?
American Bulldogs have breed-specific health vulnerabilities. ABRA-registered dogs from health-tested lines have better documented health histories.