I use Frontline Plus on all my animals, the only problem is that here in Alabama the fleas are so bad that we have to put it on them every three weeks, and still use the mink oil (which will kill fleas when you spray it on them) in between.
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Mommy of Cody,Gracie,Bella,2labs,1cat, 2 skinkids
one Angel Baby Boy

8/8/09 I carried you under my heart for 20 weeks and will carry you in my heart forever