I won't use Permethrin at all. I react badly to it in mosquito repellants and it's toxic to cats, but safe for dogs.

https://www.gov.uk/government/upload...n_spot-ons.pdf

The product I've had the best results with is Incognito from Holland & Barrett. Wonder if it would be effective on ticks and if there's a animal equivalent, or at least something with similar ingredients.

http://www.hollandandbarrett.com/sho...llent-60083768