K9Advantix is the way to go.
Revolution is not great for ticks -although great for everything else.
There are also oral medications that are effective.
Can't depend on flea/tick collars. New info suggests they are also potentially toxic
Hotspots for Lyme disease is the north shores of Erie and Lake O. Especially Long Point, Prince Edward County, Kingston and up the St Lawrence.
Nasty disease.
Be careful. You and your dog.