7They Have a Toothache
One of the conditions that can lead to loss of appetite is toothache. According to McCloskey, if your pooch is suffering from any dental problems, they will often drool excessively or chew on one side. This is a sign that your dog is experiencing some sort of dental pain.
Additionally, if you notice that your dog refuses to eat even after showing genuine excitement as they were being served their food, then they are probably afraid of dental pain. Your pooch might take one bite and walk away due to how painful it has become for them to chew. In this case, you should take them to the veterinarian immediately.
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