Is it normal for a dog to have diarrhea for one month?

It is not normal for a dog to have diarrhea for one month. Diarrhea is usually a precursor to disease.

The dog caught a cold and had diarrhea

The puppy caught a cold and had symptoms of diarrhea. The owner should increase the temperature in the kennel or add an electric heating plate to the birthing box.

Problems with breast milk

Inflammation in the female dog itself will directly affect the quality of the milk, thereby affecting the puppies, causing diarrhea in the puppies. It is recommended that the female dog be isolated and the puppies artificially fed.