If it is for dogs 11-20 pounds and he is 10, then that was the wrong dose. The vet may have given it thinking that he would grow into the dose quickly. Still an overdose and I'd get the other size.
Some of them do that. If it has lasted more than a couple minutes, there could be something more going on (burning at the site, a feeling like something is crawling, systemic allergic reaction). You may need to try and wash off whatever hasn't dried on yet. Best to call the vet.
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