I have a question for everyone...Andvantix small dose is for up to 22lbs. My Ozzy is only 3.1lbs. Do any of you only apply half a tube? A whole one seems like a lot for such a small little guy but my vet said it was ok and if you split it you may not get the full effectiveness. We have tons of ticks up here so I am really paranoid about keeping those nasty critters off my Baby but don't want to make him sick..... any thoughts?