Toy and small dogs: prepare at around 10°C.
When the outdoor temperature approaches 10°C or below, take a well-fitting jacket for toy, small, short-coated or lean dogs and use it where the dog or conditions indicate. Chihuahuas and similar dogs can lose body heat more quickly because of their small size and limited insulation.
Use 10°C as an early-warning prompt, not a universal cut-off. Wind, rain, damp fur, slow walking, waiting outside, age, health and the individual dog all affect cold tolerance. Some dogs may need a jacket above 10°C; a healthy, active, well-insulated dog may not need one at that temperature.
Choose function over fashion
A jacket should cover the back and chest, stay dry where possible and allow normal shoulder movement, breathing and toileting. Remove or change it if your dog becomes hot, wet underneath or uncomfortable.
Adapt the walk.
Shorten the route when needed and avoid prolonged waiting outside. Shivering, lifting paws, a hunched posture, slowing down, repeatedly seeking shelter or reluctance to continue are signs to return somewhere warm and dry.
Dry coats and check paws.
Dry your dog after wet or snowy walks. Check between toes for compacted snow, ice or irritation. Wipe paws and fur after contact with road grit or de-icing products, and do not allow licking until clean.
Be seen and avoid hazards.
Use reflective or illuminated walking equipment in poor light. Keep dogs away from frozen water and clean up antifreeze spills immediately; antifreeze can be fatal if swallowed.
Persistent shivering, unusual tiredness, weakness, confusion, pale gums or collapse require prompt veterinary advice. Move your dog somewhere warm and dry while contacting your vet.
Sources & further reading
Blue Cross: Winter care for your dog
PDSA: Winter health and safety
Reviewed 18 September 2026 · The 10°C figure is a practical prompt, not a clinical threshold