Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Best dog crate ever (from one who knows)

I bought these crates for my Sheltie puppies. Having had dogs for the past 30 years, I have owned all kinds of dog crates, and these are by far my favorites. They are sturdy and attractive (for dog crates), fold down small enough to be handy for travel, and are easy to fold and unfold. One of my favorite features is the door on top, which is so convenient for puppies--much easier to put them in and out this way than to crawl on the floor reaching into the back of the crate. Also, two side doors mean that the crates have easy access wherever they are placed in the room or the car.My dogs aren't heavy chewers, so I can't speak for how well these would hold up for big dogs that chew, but they seem very sturdy, and have withstood plenty of scratching from the inside without showing wear. I expect to be using them for many years to come.