My lab puppy is 3 1/2 and is now going through her teenage years. We have had her for a month and a half. We are crate training her and everything has been going really well, no accidents ever. I thought we were the lucky ones. Until, three days ago she started pooping in her crate every night. She is on the same feeding schedule, we have never changed it. She eats her last meal at 6pm and goes out several times after that to poop and pee. I don't know what to do. I need any advice you have to offer. Thank you!

Dogs do not generally poop where they lay. Are you sure she is going potty (poop) when you let her out at night? Is anyone feeding her people food or did you change the brand of dog food abruptly (both can cause digestion problems in dogs causing them to be irregular)?
Best of luck,
Kae