about quitting heartguard plus with Ranger. No heartworm meds. We use K9 advantix for flea and ticks. I only use it for dogs up to 55 pounds.A few people on the German Shepherd Nation Fb page do this so that is where I got the idea. He is only 75. It repels mosquitoes and gnats and I have never seen any even around him. I wish I knew how old he really is. He acts like a pup but is really getting white around his muzzle now. October 28 we will have had him here 3 years.