We have a 165lb Cane Corso. Put it in his room (over sized walk in closet) and the first night he took to it snoring within 5 minutes. So far seems like excellent quality and while at 8 yrs he has begining arthritis in his front ankle, he gets up not limping at all. Wish I had bought one sooner.Amazing. My 90lb Mastiff has not moved from this bed since we bought it a month ago. Unlike every other bed we’ve ever bought it still looks perfect except for a few holes in the cover from her nails but no big deal. It immediately takes its shape again like the first day we got it. It’s expensive but I’ve wasted 3x this amount on beds that went flat in 3 weeks.MY pitt Sookie is 10 yrs old now. she has developed arthritsis in her hips. It's difficult for her to jump up on our bed sometimes. I did not want her sleeping on the hrd floor all night. So I ordered the bully bed. Boy was I surprised!! I ordered the largest size. Sookie is 80lbs. and I was 150 at 5'5'. We both can lay on it comfortablly!!! The mattress feels like a top quailty bed cause it is. Truthfully she didn't need that size. But I didn't measure correctly!! So measure carefully you can't get it back in the BOX!!!! The size we have must be for Mastiff owners. Either way I'm not sorry we got it.I wanted the absolute best money could buy for my 11 year old 200 lb Mastiff, and this product is very disappointing given the high cost. (at least twice as much as other quality items). For the price point this thing should show quality right out of the box, and instead is appears to be a little less than average at best. The cover is definitely not built for large breed dogs as has a single row of flimsy stitching (with a regular zipper) that appears to be unraveling the first day. This product will not last very long, and is supposed to be specifically BUILT for massive breed dogs. This company advertises a lot of high quality features, including a heavy duty zipper, that simply are not true. Unfortunately the exceptional quality promised in the description, and on their website, has turned into a bait and switch for a mediocre product at most. It is not what is described and not the quality promised. Thankfully, this is specifically why we purchase items such as this on Amazon and not directly from the seller. The return policy we rarely use, but when needed, this is why Amazon is so good at what they do.I bought the XL bed for my Catahoula/Great Dane mix and the medium for my Standard long-haired Dachshund. They arrived rolled up wrapped in multiple layers of plastic. Easy to unwrap and quick to fluff up to size. The xl bed was sturdy enough to support ME without sinking to the floor. Both of the dogs immediately jumped on and were comfortable side by side so there’s more than enough room. No bunched up fabric very smooth easy to vacuum or wipe with a cloth. I am so pleased with this item. It’s investing in the health and wellness of your dog and undoubtedly the last dog bed you’ll ever have to purchase. So relieved to have a quality product for my pups...we’re all happy!Update: Jan 2021 still super happy with these beds- I’ve bought three of them- no seams tearing or loose threads, have washed the covers probably four times already and they’ve held up and didn’t shrink! My dog digs before she lays down, sometimes pretty rough, I was worried the cover would tear but NOPE! I am so impressed by this quality bed I tell everyone who is looking for a dog bed.... I’d probably even go as far as to recommend it for a toddler...the mattress really supports you, occasionally I’ll lay on the bed playing with my pups and it is so comfortable, most importantly you don’t sink through to the floor. To say I’m impressed is an understatement.This bed is just what I wanted for my dog. He is an almost 100lbs German Shepard and the X-Large bed is the perfect size. I didn't want to get a huge bed that takes up too much space so I'm glad I went with the X-Large that I got. Its a big bed but easy enough to move around when needed. My petite girlfriend moves around without issue. Easy to vacuum the hair off and the cover comes off fairly easy. Its a little bit of a struggle due to the size and snug fit so four stars. My dog really loves his bed and with the quality of the materials used to make the bed I'd bet he would say its really comfortable. Another thing to note is that with the quality of the mattress my dog sleeps on top of the mattress he does sink into it like cheaper beds I've had. Buy this bed for your dog and never worry about buying another one.