Pro 550 Plus hands down if you have used the Pro 550 before. It will track 3 dogs and is about as simple as simple can be. I have a Garmin 320 and sold it. I didn't use half the stuff on it and every time I pulled it out I had to sorta figure it out all over again. FWIW, I run two dogs and also keep the spare collar in the truck and running. Therefore no matter where I wander off to looking for a dog, I can always hit a button and see an arrow to take me right back to the truck. Easy Peasy.
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