Why dogs lick their body?🐶 There are various reasons why a dog might develop skin diseases. Some common causes include: 1. **Allergies**: Dogs can develop allergic reactions to various things such as certain foods, pollen, mold, dust mites, or flea saliva. 2. **Parasites**: Fleas, ticks, mites, and other parasites can cause irritation and skin problems in dogs. 3. **Bacterial or Fungal Infections**: Bacteria and fungi can infect a dog’s skin, leading to conditions like pyoderma or ringworm. 4.