Here's why it's important to see a vet:
* Underlying medical condition: Tail chewing can be a symptom of various medical conditions, such as allergies, parasites, anxiety, or even pain.
* Infection: The white discharge could indicate an infection, which needs prompt treatment.
* Self-harm: Continuous tail chewing can lead to serious injuries and infections.
Please don't delay in seeking veterinary care for your dog. Your vet can diagnose the cause of the tail chewing and provide appropriate treatment.