Sometimes the scratching isn't just about the fleas being present. Sometimes the damage done to the skin from the scratching from the fleas that were present before can turn into a skin infection called pyoderma which is also itchy.
As far as the frontline goes...we use it on our dogs. It needs to contact the skin and not the hair. You part the hair in between the shoulder blades and put the applicator directly onto the skin. If he was able to lick any of it, it could have made him sick or he might just have had a reaction to it. There are other products out there like Comfortis that might be better for him.
Bianka vom Eisernen Loewen IPO3, CGC, TC 1-3-08
Cade vom Eisernen Loewen IPO1, CGC 3-25-09
D'Artagnan (Tag) vom Eisernen Loewen BH 2-2-10
G Aiko von Burkndeiros SchH 3, IPO3, FH, TC, KKL2 9-17-02 (Retired)
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