There is an older version of Frontline that does NOT have the PLUS on the box. Only the one with the PLUS on it has the growth regulator in it to help kill fleas in your home and keep them from reproducing. Both versions of Frontline work equal at killing adult fleas.
Fleas are an intermediate host to tapeworms. When a pet ingests a flea carrying the tapeworm larva then it gets into your pet. Yes, it's definately yucky. Just keep watch for them, usually takes 3-6 weeks before they show up. Normallyl only pets that show signs of tapeworm are treated.
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