I purchased the "Monkey" print pajamas for our fur baby. I was worried about sizing and afraid it may be too short. So I purchased a size large. He's a Schnau-Tzu (part miniature Schnauzer & part Shih Tzu). He's short & has a long body like a Shih Tzu. He is only 4 1/2 months old. He weighs about 8 lbs. So the large is a bit long on his body. The bottom will slide down to past where his tail meets his body. I have to pull it up a bit. He sometimes gets his back legs out of the Pj's but not on purpose. It's because he's lounging or napping and it just happens. I probably should have got a size Medium but this is 100% cotton. So I worry it may shrink when washed. I won't put it in the dryer for that reason. He is able to potty perfectly fine without making any mess on the pajamas. These are so cute and very soft. He doesn't act like they bother him at all. They arent constricting. We noticed he was getting shivers early in the mornings. It's probably because of walking on the cold tile floors so I wanted to try something different from the usual sweaters or those type clothing items. He also hates being under the covers so I had to find something different. This isn't really thick so don't worry about overheating. It's actually sort of tshirt like material. It reminds me of the same type material used for newborn infant pajamas. They are well made; no loose strings, etc. It works for us. He is comfy & so stinking cute. I'm fine with these being a little big so he has room to grow and also just in case they shrink. Definitely recommend these to anyone who has a fur baby who will wear clothes, needs a little extra something for warmth or you just wanna see the cutest thing ever! I've already recommended these to my friends. They are seriously that cute!