Our 3 cherubs are good with the Scalibor collars and we have used that for the last 2-3 years. We did use the spot on Frontline, but there was a lot of negative press about them so switched to Frontline collars. However our vet suggested the change to Scalibor as our dogs love to swim and she said the Scalibor effective life is better than the Frontline in that regard.

Can't remember last time we had a tick TBH so guess both are effective for our brood.

As our's never had a reaction we stick with whats working, I know some dogs do have reactions so here is a link to some natural products which seem to get good press.
http://shop.mercola.com/catalog/flea-tick,548,0,0.htm
http://www.amazon.com/Mercola-Natura...ews/B004GTD3UK

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How do you know if a Frenchman has been in your garden.... your rubbish is gone, your dog is pregnant.... but at least your cabbages are pest free