you might be able to "control" fleas naturally but you aren't going to get rid of them once you have them. And once you have them they are going to multiple and multiple and eventually chemicals will be needed. Diet helps but is certainly doesn't PREVENT. Even the healthiest of animals get fleas. It's just the way it is.
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My dog is allergic to fleas for a mystery reason, we don't even know how she spent the first 6 months of her life it just is the way it is.
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I avoid using garlic as a supplement for my dog primarily because while it is toxic in higher quantities that doesn't mean a dog won't have an adverse reaction of some kind to a small amount. Every dog is different just like every human is different...
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Sorry I skimmed the link missed the Food grade part. I was just saying in general it needs to be food grade. We use it on our chicken coop for mites and other buggies. Love the stuff.
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Not using a heart worm preventative can be good and bad depending on where you live...
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I don't use one until summer when the temps are going to be above 58 degrees continually. I think it is stupid not to use one during seasons in which the larvae can develop. I read a whole big thing about the heart worm life cycle and I do think it is CRAZY that vets insist your dog needs a heart worm pill during the winter (if you live in colder climates) where it is LITERALLY impossible for your dog to get it, if only because of the temperatures. That said, I have known people who refused to do heart worm pills for their dogs and I know at least one dog who died from trying to be treated for the heart worms he got. It is a terribly sad thing that can be very easily prevented.