intermountainpet.com, small dogs like Chihuahuas and Yorkshire Terriers can typically deal with temperatures between 50 and 60 degrees.
Owners should keep an eye on their dogs to see how they react to temperatures below that threshold.Depending on the breed, it could be unsafe for small dogs to be out in 30 to 40-degree weather.
Dogs with heavy coats like a Maltese could probably withstand the temps better than a Chinese Crested. Hairless pups should consider a sweater.Temperatures below 25 degrees is dipping into the dangerous category, according to veterinarian Jennifer Coates as written on Pet MD.Dogs who are considered medium are typically between 25 and 60 pounds.