Does anyone use or have experience with this product? Just wanted to get some opinions. Thanks.

I have seen the commercials for this product over the last few years. I can't remember where I read it but it was in the last 6 months, there were some negative reviews of this product. I don't recall the specifics, but the dogs and cats using this product had some major medical problems after using the product. I would treat the yard instead of putting chemicals, in a collar, on your dog or cat.

Imidacloprid is an insecticidal agent in K9 Advantix.
It is supplied as a topical solution that collects in the oils of the skin and in hair follicles. It is not absorbed into the body and DOES NOT CIRCULATE THROUGH THE BLOODSTREAM.

For those of you who are not seeing results, if you purchased the product from a merchant that isn't a Bayer recognized distributor, you may not be getting the "real" K9 Advantix, thus not seeing results.
I had this problem when I went shopping on the internet to save money too, and my dog had a really adverse reaction. Since buying from my vet, I did not have the same problems.

Many dogs have severe adverse reactions to this product, which are probably allergic reactions. These folks should obviously not use this product. Unfortunately the only way to find out if the dog is allergic, is to try the product.

My dog gets really itchy for 3-7 days after application. Those of you who have seen posts describing "acting strange,wiggling around, shaking their hind legs, chewing", etc, this is because they are itchy. Sometimes an oatmeal shampoo or tea tree oil bath (more than 48 hours after application) helps ease the itching.

K9 Advantix is the most broad spectrum topical, giving you the most for your money.

It kills FLEAS, their larvae and eggs that come into contact with the dog. If you treat the dog and not his surroundings, you will not get rid of your flea problem.

It kills TICKS on contact. I had to treat my dog with antibiotics (which are toxic to their immune system) for Lyme disease. I have what I believe to be the lesser of two evils by putting a non-absorbed topical on him.
Deer ticks are carriers of other diseases besides Lyme, and now I can walk in the woods with my dog and not have to worry about this problem.

This product also kills MOSQUITOES on contact. No other topical product does this. Anyone living in a non-arid region of the US, now needs to be concerned with WEST NILE VIRUS . If you are outside ANY TIME of the day when it's warm out, mosquitoes bite you and your dog.

I use this and the only issue I have had is the residue that stays on the hair for about three days. There is no odor and it works great. Not one tick or flea in months. But it's not cheap........