Excellent for my pets! Dog, 2 kitties and litter box trained bunny! I have a mini Aussie who can run through it and my sister's dogs are larger but they can still turn around in it and go through it. It is a huge hit....My dog's 9 years old & experienced in agility courses. Loves this for playing at home...sometimes all the pets are in it together. :) & it's not scary for any of them, sinceit has a couple of mesh windows.