I've had my 10 month old lab mix for about 4 months and want to make sure that when I apply Frontline Plus I am doing it correct. I guess my question is, is it normal for his hair in the area I applied it, to feel kind of stiff and oily for 1-2 days? I do my best to get down to his skin and then squeeze it all on. I just want to make sure I am doing it right. Thanks.