Whether you are using a traditional e-collar or a dog cone alternative, fit is incredibly important. Make sure to measure your dog’s neck according to manufacturer instructions and order the appropriate size according to the size chart. When fitting the cone on your dog, it should be tight enough so your dog’s head cannot slip out. You should be able to place two stacked fingers comfortably between your dog’s neck and the cone to ensure comfort. The cone should not hit against the floor when your dog is walking.