Establishing a Routine
It's easy to predict when puppies will need to go to the bathroom. You can count on a potty trip first thing in the morning when they wake up, after every meal, after a nap, and after an energetic play session. Use this knowledge to set up a housetraining schedule that will reduce or eliminate accidents in your home.
When you take your pug out at specific times, he learns when and where it's okay to go potty. Use a timer or alarm clock to remind yourself to take the dog out at set intervals. A good rule of paw is to base the frequency of trips on the dog's age in months. A two-monthold might need to go out every two hours, a three-month-old every three hours, and so on. Remember that each dog is an individual. Your pug may need to go out more or less frequently.
Take Him out on Leash
Why take your pug out to potty on leash? Because you need to make sure he really does potty, and you need to be there to praise him when he does. Too often, people put their dogs out in the back yard and just assume that they've peed and pooped. Then the dog comes in, potties on the carpet, and earns himself a scolding he doesn't understand. Your pug doesn't know why he's outside, so you need to be there to “explain” it to him by praising his actions.
If your dog doesn't eliminate after ten or fifteen minutes, take him inside and put him in his crate. Try again in half an hour. Follow the same routine after every meal, after every playtime, and before bedtime. Try to take the dog to the same spot every time. Spend some time playing with him before you go back inside — but only after he potties.
A pug puppy's holding capacity varies. Some need trips outside every hour on the hour, while others can make it for two or three hours. Sample schedules that you see in books are just that — samples! You need to figure out your own schedule based on your pug's needs.
Change this routine only if your pup needs to go out in the middle of the night. As soon as he potties, take him back inside and put him in his crate. You don't want him to start demanding playtime at two in the morning.