A great way to tame any passive dino is to use billboards. They work similarly to the dinosaur gateway method.

Prep: Kibble, narcotics (if necessary), tranq arrows/darts and 3-4 wooden billboards.

Step 1: Approach the dino, placing the first billboard as to trap its head. If done correctly, the dino will attempt to keep walking as normal, stuck underneath the structure.

Step 2: Place the remaining billboards around the dino, ensuring that it will not escape once aggravated. Make sure there are no large gaps between the boards.

Step 3: Prepare your preferred method and knock out the dino. The dino will not attempt to break the structure. If the dino is a passive tame, this step will not be necessary.

Step 4: Tame the dino and defend it.

Enjoy your new dino.