On the Island go to the bottom of the Frozen Tooth mountain and you will see a couple of them. If there are level 1-10s kill all of them because they die too easily when you try to knock them out. If you found your desired one try to pull it to a clean area with a flying creature and bola it and knock it out. Be aware of the nearby other sabertooths and argentarvises and pulmonoscorpiuses as they might attack you and your tame. Go there with a strong argentarvis so you can carry out the tamed animal. I did exactly this and got a level 19+4 levels and exported it out to herbi island with the argentarvis.