Wow , I bought that stuff months ago but haven't had to use it yet, but I thought it was supposed to be put on the back of their necks like a dog or cat?

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Hello MaryFrontline is a great product for dogs and cats, but is NOT approved for any livestock in the USA. It will be in the eggs for the lifetime of the hen, and who knows how long in the meat. Permethrin spray is safe, easy to use, and approved for poultry. Also inexpensive. There's no reason to use an unapproved product when there's such an excellent alternative. Mary