Our expert says:
I would advise that you visit your local vet and have a thorough check-up. If the chewing appears abnormal then there could be an underlying condition be that physical and/or medical problem.
One medical condition that comes to mind is a disease called Masticatory Muscle Mycositis. This is an inflammatory condition that primarily affects the muscles of mastication. The clinical sign’s may include swelling of the jaw muscles, drooling and pain on opening of the mouth.
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