Why does my 13 week old mastiff pee all the time when not crated (every 30 minutes)? No accidents at night.?

dogs naturally will not soil their sleeping spaces. That's why crate training works so well. It speeds up the potty training process tremendously. Your pup is still young and will need to relieve himself after playing, after waking up from naps, after eating etc... Take him out after any activity and give him an opportunity to relieve himself. Your pup was used to being able to releive himself when ever he wanted or needed to in the kennel. He may need some extra time to adjust to his new enviroment. Establish a schedule and stick too it. This will help your pup know what he can expect and when. At 13 weeks their bladder is still not that strong. Witholding water after 7pm each night may help alleviate extra bathroom trips. Take your pup out right before bed time to ensure he'll sleep through the night. It could be a UTI, is he displaying any UTI symptoms? Have you taken him to the vet for a check up since bringing him home? If not a trip for an puppy exam is crucial. They can administer any needed vaccinations and worm your puppy, and put him on a heartworm perventative if this has not been completed. Your vet will also be able to advise you on your pet's diet and check to see if there may be an underlying cause for your pet not taking in enough fluids. You might consider offering your pet cold water from the refridgerator to entice him to drink more.