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Licking in the manner you indicate could be a sign that your dog has nausea or a problem with anemia, a liver issue, or even a seizure problem.
Nausea can be caused by a dietary indiscretion, liver disease, a touch of pancreatitis or even inflammatory bowel disease and a side effect as well.. It seems you tried pepto, but you might try some pepcid instead. Read about dosages and usage information here:
A dental issue can cause a dog to lick excessively as well though you usually see drooling with dental issues. Partial seizure activity can manifest as licking. However, in some cases, licking is just an attention getting behavior or a way of dealing with anxiety. Some dog also have obsessive compulsive disorder.
In this case, the licking is likely the result of an upset stomach which could be a side effect of the gentacalm. You can read more about gentacalm here:
I would not use it on him again and I would notify your vet as well.
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