Tiny dogs lose heat faster due to a higher surface area to body mass ratio.
Toy Breeds
Breeds like pit bulls, greyhounds and boxer dogs get chilly without more coverage.
Dogs With Very Short Coats
Older dogs are more susceptible to arthritis and chilled muscles and joints.
Senior Dogs
Dogs who shudder in cold weather benefit from an insulating layer.
Dogs Prone to Trembling
Layering helps dogs maintain body heat if recovering from conditions or procedures.
After Surgery or Illness
Working, sporting and sled dogs need warm winter gear for long outdoor stints.
Outdoor Dogs
Don't force clothes on dogs with adequate fur coats who dislike wearing them.
Avoid If Unnecessary