Hi Jean, great question!!
I would not recommend the product be ingested, so I side with you!! I have never used this product in clinic practice and would be leary of using it as an "oral" medication.
As this product contains Camphor, it is HIGHLY irritating to the oral and GI linings...at high enough doses, it can cause SEIZURES!!!
I don't care WHAT your vet said....do not use it as directed by your vet!!
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Best wishes to your and your pet, Dr. Smith