Write the next sentence in this paragraph:

How to train your dog to roll over
Make sure your dog knows how to lie down.
This is an essential first step for completing the roll over trick, since the dog has to be lying down to perform it. If your dog doesn't respond to the " lie down " command, train him to do that first.

Pick your answer from:
-At the same time, make sure he understands that laying down is very important for its health. Unroll before the roll over trick is completed..
-This way, you can reestablish trust with your dog after the trick has been done, and the power of your command is communicated to him. A dog's natural instinct is to chase after food..
-You can also start by letting your dog lie on his side. This may help him initially learn to roll over..
-If your dog can't roll over, the trick is complete. Just make sure that your dog is lying down on his stomach..
You can also start by letting your dog lie on his side. This may help him initially learn to roll over.