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Anonymous
Like others have said, my vet told me fleas are becoming immune to Advantage and Frontline, so I started using Comfortis. It worked well the first few months, not sure right now though since I have found some fleas on him. I think they are coming from the cats though...... Also, I think the minimum amount of time you should give between doses of Advantage is 3 weeks, not positive. You could get him a Capstar, that kills fleas right away but doesn't keep them off. The Advantage may keep them off after that though.
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