Ordered 12 doses of Revolution and received 12 doses of the less expensive Stronghold without being asked in advance. Their website doesn't even offer Stronghold as an option to purchase so why is it being substituted for Revolution? When I called, I was offered a $10 credit but the difference between the 2 products is over $30. I have no idea if this is CanadaPetCare's standard practice but I would say buyer beware or if you're okay with Stronghold, you might want to go to another website and save on costs.