ME300 - under 10lbs

For small dogs, the contact points are approximately 20% closer to one another and the collar can be turned 90 degrees on the strap for a “fore and aft” contact point position rather than having the contact points going around the neck. Like the ET-300, it is still rated for dogs 5 lbs and up, but the newer configuration allows for more options when fitting it to a very small dog.