Halo Collar 5 review takes a closer look at how this GPS dog collar performs in actual trips beyond the backyard. The collar is designed particularly for Ozzy and his terrier mix, Balou, to provide effective monitoring of their pet when camping, woodland trekking, dock time and transit to new destinations. Better GPS accuracy because of Precision+ makes it easy to know where your dog is without having to guess all the time. It works as a GPS dog collar, GPS dog fence and wire