Here's what I recommend you do:
1. Contact your veterinarian immediately. They can help you determine the cause of your dog's behavior and recommend the best course of action.
2. Provide any relevant information to your vet. Tell them how long your dog has been acting this way, if they've shown any other symptoms (like vomiting, diarrhea, or lethargy), and any recent changes in their environment or diet.
3. Take your dog to the vet as soon as possible. Don't delay seeking professional help.
It's important to remember: I am not a veterinarian, and this information is not a substitute for professional medical advice. Only a qualified vet can diagnose and treat your dog's condition.