Very interesting information about the oils, thank you Val. Drogo and Whisker Biscuit (my cat) do interact some but it's minimal and there's no physical contact, so I think it would be okay. I just bought a 4 month supply of Advantage so I think I'll be taking it back for a refund!

You could save the Advantage for next summer as a back up. While I do rely mostly on the natural stuff I do like having Advantix on hand just in case. We did have an incident this summer when we went to the mountains and did a lot of hiking in wooded areas and I forgot to put their oils on and didn't bring their ACV or garlic on the trip. They were completely unprotected (my fault, I forgot to bring their stuff) for a week and my chi girls did end up getting fleas by the end of the week. When we got home from vacation I was so glad to have some Advantix waiting for me!

I actually have a 4 month supply already, I just decided to stock up since it was on sale. I have to say I'm really surprised it only takes 1 drop on their collar to work. Must be some really potent stuff!

Hey, all I know is that it works! It smells really strong the first day but by the second day it's not too noticeable. Plus, because you use so little it lasts forever. I'm still on the first bottles of Rose Geranium oil and Cedarwood oil that I bought for less than $10 a piece back in June 2010.

Was reading this and noticed someone mentioned Vectra 3D - I would NEVER use that product. It is a Hartz product that they produce under a alias. I will NEVER use hartz products personally if they work or not (which to me generally they do not).