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Originally Posted by Ellie May  Sentinel has the same active ingredient as Program for the flea protection part of it. 
Isn't that such a cool ingredient?! No side effects for that part of it anyway. |
I'm bad, I've never read what's in it, I just know my Mom has been using it for a few years, and I had the shepherd on it all summer last year, and never saw her itching once. Am going to put all 6 of them on it this year