This was something that I got from a friend of mine for use when you find a tick on a person. Don't know if it will work on dogs.

Take a cotton ball and soak it in liquid soap, such as dish soap or hand soap, and I mean really soak it, dripping with soap, cover the tick with the cotton ball for about a minute, when you pull the cotton ball off the tick will come with it.

Hope it works.

Mark