| He is testing his dominance. This is a natural part of his growth to try to become the pack leader. If he is doing this to you instead of the other rottie then both rotties see you as second in the pack under the other dog. Unless the other dog is total passive and is weak in nature. You need to establish that you are number one in your pack. Your dog should be now know basic obedience sit, down, stay and heel. Use the down to establish that you are number one. Give the down command, then the stay for five minutes work on this a couple times a week. If he is going to test you it will be here, and now your ready to correct his behavior. I would suggest that you go to a pro handler if this is too difficult. Go to a pro anyway.
Orville
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