Every dog is various, just like people, as well as therefore while some of them will use it the first time they see it, others might be cautious and smell it to see if they can find some information regarding it. However, it would certainly be still far better if a person stood on the opposite side with a pet dog reward or one of his favored toys to lure him with the dog door. Your canine will certainly experience the dog door when you hold the flap away, but will certainly decline to go outside on his very own.
