He licked it?

Specifically where did you get the Advantage?

Yes, mine got a bald spot where I put the whole tube at the back of his
neck in May, with no sign of redness or irritation.  The last two years I
had used the regular Advantage, with no problems.  This year we used the
Advantage Multi which is also good for hookworm, roundworm, heartworm and
bugs and In June I noticed a bald area.  I phoned my vet and asked her if I
should continue and she said yes, if it's not irritated.  I put it on in
June and July, and so far he's ok. I think next year I'll go back to the
regular Advantage.  

Bobble