Yes! Start training them early early early. Be firm but make training fun. Remember they're just a pup and should be given some leeway in the beginning. Things will happen that you can't account for. Don't stress out about them, just keep trying to move forward. If they have an accident in the house, don't rub their face in it, don't do anything unless you catch them IN THE ACT. If you catch them in the act, tell them no and pick them up and take them outside and praise and treat them for continuing to go outside. Pups have a reflex that makes them instantly stop going to the bathroom when they're picked up.