Had Sadie out in the yard today. Her boundary training with the e-collar is going great. I accidently threw her frisbee too far and it went past the boundary. I beeped the collar, and she stopped and waited for me to go find it. She is doing great. Plus, she has the most amazing temperment. Every person she meets is a long lost friend. BTW: This frisbee is amazing. Had it about 3-4 years now and there are no holes in the thing. Its nice and soft rubberish sort of. Sadie was chewing on it, and didnt even make a dent. It's JAWZ Hyperflite. She's 6 months 2 weeks and 5 days old today.