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My name is***** and I am sorry to hear that your pup is acting so strangely.
Drooling is often caused by nausea, dental disease, or something bad tasting in the mouth. Was he trying to lick the flea spray off his fur? These often taste really bad to deter the pets from licking and children from getting it in their mouths.
Also, if he is licking the spray, it may be irritating his tongue and causing the color change. Frontline is very safe, but I am not familiar with "vets best spray." I am going to look that up.
Does this help? What other questions do you have?
Okay, I looked that one up- it contains peppermint oil and clove oil. Both of these are essential oils and, if licked or ingested can cause irritation to the mouth and drooling.
Does this help?