Is My Dog Pregnant If Rectal Temp 99.3?

Normal rectal temperature in dogs is 100.5-102.5^o F. Reduction in temperature in dogs does not indicate pregnancy but can be indication of start of labor in pregnant dogs. If your dos is not pregnant and having a rectal temperature below 100 then it can be due to following reasons.

1. Exposure to cold for longer duration
2. Problems in the temperature control center of dogs
3. Hypothyroidism
4. Impaired behavioral response

If your dog is also showing signs of illnesses then take him to vet for diagnosis and advice.