I have been looking to purchase for some time as my dog paces in the back seat during car rides, bought this before my 19 hour move across the country with Zazu (my 60 lbs pup). I was concerned when I first got it that it didn't fit right, I emailed sleepypod customer service with pictures and they quickly responded saying they felt it was the best size and model for him. We practiced a lot before the trip with small rides, and he quickly got used to sleeping or sitting and looking out the window. This calmed him down in the car and he did great on the road trip, I think he felt more secure so he relaxed and I was less worried about him and more focused on the road. Also did well during breaks on walks, and on a few short hikes. We use this harness all the time now in the car. Pricey but worth it! Shipping was fast with Pawlicious!