Well, our story isn't much different than that of BuckysMommy. An hour after dosing our two dogs one was acting very bizarre--staring at nothing, leaping around, rolling and growling, chewing and scratching herself, etc. By midnight it was clear that we needed to take some actions. We washed her thoroughly. She at least was then able to sleep and appears better today, but still acting strangely. Now we take her to the vet.
No more Sentry products for us. Frontline posed no problems for our pets. We just ran out and bought some Sentry at the pet store. Bad idea! My next step is to write the company and let them know my concerns about their product. I hope others with similar experiences wiill do the same.