Early symptoms of canine distemper in dogs:

1. In the early stages of canine distemper, dogs will have a fever, and their body temperature may rise to about 39 degrees.

2. During the fever process, it will cause the dog to become depressed. As a result, the dog is no longer so lively and does not like to play games.

3. Generally, after the fever lasts for two days, the dog’s body temperature will return to normal, but the dog’s mental state will still be poor.

4. Dogs will begin to have symptoms similar to colds, such as runny nose, cough, etc. The cough will worsen especially in the morning and evening.

5. The dog's body temperature will begin to rise again, even as high as about 40 degrees, and the fever will not go away. At this time, it has gradually developed into the middle stage of canine distemper.

6. Some enteritis-type canine distemper can also cause symptoms such as diarrhea, vomiting, and loss of appetite in dogs.