9. Skin fold pyoderma
This is a skin infection that appears between the skin folds, causing a powerful, musty odor. Skin fold pyoderma commonly occurs in overweight pups or dog breeds that have skin rolls, including mastiffs, shar-peis, English bulldogs, and pugs. However, this type of infection can still occur in pups of any breed, size, and age.
The infection-related odor is pungent, and the problem itself can generate pain and itchiness. In this case, you should visit your vet ASAP to treat the infection because if it was ignored, it can quickly worsen and might even require surgery.