how can I train my dog to use dog flap ?

Answers:
Use treats and positive reenforcement. Lure your dog through the flap, treat and praise him. If the dog goes around the door, put him back on the other side and continue using treats to lure him through the door. Also, give a vocal command such as out or walk to queue him to the action. After a few days of luring, you should be able to put a treat out side the door, door closed, command the dog to go out.

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Sit on the other side of the flap and have the dog on the opposite side, peek through it with a treat and entice him to come through, keep doing this until he gets the idea.

Good luck!

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A doggy door you mean?
I just had this same problem. I just put in two of them for my two dogs.
It is a lot of repitition. just sit with them and make them go in and out. It took my dogs about two weeks to get used to it. Oh and lots of praise.

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crawl through it first, just kidding..go outside of the door w/ a treat, call his name , open the flap show him the treat, and go from there.

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take the dog food and place it either outside or inside,it depends upon the location of the dog.if he is inside the house then place it outside and viceversa.wait for a few moments snd see if the dog goes through the flap to get to the food,surely u would do this at a time when he is very hungry.another trick is that when u take your dog outside for a walk and return home leave the dog outside and close the door after some time the dog will come in through the flap. ih ope it makes sense.

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Put a piece of meat on the other side. Should take a couple seconds.

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do what Michelle Lynn said %26 when the dog does it make a BIG deal out of it %26 praise the pooch, it worked for my in laws