how can i train my Labrador easily housebroken .?

Answers:
It is a matter of training YOU to let the dog out enough so that it does it's business outside. But everytime you take him out, you should gently reinforce the good behaviour. When he pees, you say "Good BOY! You PEED outside!" and pat him and make a short fuss over it. The same for when he defecates.

A dog always wants to please. When he learns that this behaviour pleases you, he will continue to do it.

If he slips up and goes in the house, then saying in a sad voice "No. That was bad!" and looking and sounding sad at him will reinforce that this is unacceptable behaviour.

You don't want to ever hit a dog, because your dog may then turn out angry and distrustful.

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crate train him/her first introduce the crate as a safe fun place get him/her into the crate by throwing treats in farther and father into the crate till there in then start to close the door and then when you take her/him out bring them right to the designated potty area DO NOT play with them before or they will associate that potty spot with fun rather just turn your head and wait once they go give LOTS of praise.

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Depending on your dogs age the approach to housebreaking will change. If your Lab is a pup, use PeePads moving them slowly toward the door each day. Soon the pup will go to the door and you will know he needs to go out. If it is an older dog. You must be vigilant in paying attention to him. Use a clicker and bite size treats to get him to signal you when he needs to go out.

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try obedience classes so YOU can learn how to train a dog.

House training involved appropriate (not violent) punishment when the dog goes in the house, but it also involved PRAISE when the dog goes where he is supposed to go. BOTH aspects need to be provided EVERY TIME - consistent, persistent training is what a dog needs.