I have a 4 mo. old puppy and was wondering what was the max time I should allow the puppy to be in the crate.
Hi At this age your puppy should be able to 'hold it' for up to 6 hours at a stretch during the day, and 8 hours at night. Of course, all puppies are different though, and there's no concrete 'one-size-fits-all' answer to this question.
Small and tiny breeds often have more difficulty with this as they have tiny bladders.
If you leave your pup crated for this amount of time during the day, it's important to make sure that he gets plenty of one-on-one time and lots of exercise when you are home. Pups can get very bored and anxious if they're crated for long periods and don't get a chance to spend time with their owners or work off that excess puppy energy.
I'd also recommend that you take a look at my Crate Training A Puppy page as it has lots of tips and advice to help you out.