Do not fight them in the water! I tamed a pachyrhino and was on a level 250 wolf going across the river when it attacked and killed me and the pachyrhino. Its stun attack makes it impossible to fight back. I had to respawn and get my rex down there to save the wolf. If u and your tame are submerged u will be stunned and die so cross rivers on bigger dinos or just do it quickly.

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