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Hi, I gave my cat Hartz UltraGuard fleas and ticks. It didn’t work and fleas are growing in number. I was told that it is because my cat is large (15lbs) and also to stop Hartz because the treatment might be toxic. How long do I have to wait to give him advantage II for large cats? What can I do while I wait, since the fleas are still alive? Thank you!

Hi, I gave my cat Hartz UltraGuard fleas and ticks. It didn’t work and fleas are growing in number. I was told that it is because my cat is large (15lbs) and also to stop Hartz because the treatment might be toxic. How long do I have to wait to give him advantage II for large cats? What can I do while I wait, since the fleas are still alive? Thank you!

Updated On May 7th, 2020

Pet's info: Cat | American Shorthair | Male | neutered | 2 years and 3 months old | 15 lbs

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Answered By Dr. Strydom, DVM

Veterinarian

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If you want an effective product please use one of newer ones like Cheristin. I don't think you will get any better results with Advantage. It is recommended to wait a minimum of 3 weeks between product applications. https://worldtails.securevetsource.com/itemView/view/198944_HomeDelivery.pml?productId=115569 While you wait you can get Capstar and give him that every couple days if need be. One pill lasts 24 hours but will kill everything on him. https://www.petco.com/shop/en/petcostore/product/capstar-flea-tablets-for-cats-2-25-lbs You also need to treat the house or the fleas will keep getting on him. I recommend Knockout Spray ES: https://www.chewy.com/virbac-knockout-es-area-treatment/dp/53856

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