My established dog always seems a little off colour after his monthly flea treatment (endectrid, from the vets) and will try to get away when it is being applied. I spoke to some other dog owners whose dogs reacted the same and who thought it was the smell they didn't like. I used it on my new dog yesterday for the first time and she's not eating this morning. I'm not overly concerned (we've actually been to the vets this morning to have a stitch removed) as I think it will pass but obviously I'd rather she felt better. Do your dogs react like this?