I used SentryPro xfc on my labrador, and it nearly poisoned her to death.  She's still not in the clear.  After she reacted this way I did some research and learned that she's not alone -- this product has caused neurological disorders and nerve damage in many many dogs.  It poisons dogs through their skin.  Dogs on this product develope behavioral problems and often have seizures.  My poor lab cried all night long after this was used on her.  Do yourself and your dog a favor, don't buy it!!!