he has been known top head out for days at a time. we start with tagg dog tracker. >> it relays his location via gps and i can track it via smartphone app. i hope this works. we let him go and as expected sleddie took off but tagg has located him. he's on the move. >> reporter: you can create a virtual fence. if he strays tagg can send alerts to your phone. >> you are exactly writ says you should be. >> next up whistle. it tracks pet's activities, how many minutes walking, resting. basically a fit bit that is motivating you to take the dog out more often. okay. according to whistle, during this little jaunt, sleddie did 29 minutes of vigorous activity. good job, sleddie. if your primary concern is your dog's health or if it has a medical condition, consider voyce. it monitors breathing rate, heart rate and calories burned.