well they contain fipronil. This has stopped working on fleas in some parts of the UK, so its going to depend on where you live. My dog can’t have fipronil products as they bring him out in blisters.
If you want to use a fipronil based product, just google for the cheapest one.
Thank you
One of my cats goes mad whenI "blob" him - it is ilk the is being burnt so I switched to the injections that are supposed to make the fleas sterile and this seemed to work for a time until the vet would not do it any more.
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