Dehydartion is classified in yerms of the

I think , you mean Dehydration.
Dehydration is classified in the terms of
• percentage of the weight loss exclusively due to loss of fluid.
• subjective amount of thirst a person experiences .
• relative amount of fluids consumed against the amount of urine excreted.
• amount of weight lost relative to a person's original weight .

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As long as it was one lick and the dog is a bigger dog, it should be fine. watch it carefully for a few days.