Causes of dog body odor:

1. Dog body odor may be an oral disease. When a dog suffers from stomatitis or tartar on its teeth, it will cause bad breath and then body odor.

2. Dog body odor may be an ear disease. If a dog suffers from ear mites or bacterial infection, it will cause the ears to emit an unpleasant odor.

3. Dog body odor may be a skin disease. When a dog suffers from diseases such as fungi, mites, eczema, or is infected with parasites, it may cause the dog's skin to smell bad.

4. Dog body odor may be a gastrointestinal disease. When dogs have indigestion or are often constipated, they will also emit odor through their mouths. This is common in dogs who eat too much meat or drink too little water.

5. Dog body odor may be due to endocrine disorders. When a dog is in heat or has endocrine disorders caused by certain diseases, it will emit an abnormal smell.