The best way I have found to tame a saber is to throw a bola at it and tame it there, they typically spawn by creatures like carnos and Argens which provide you prime meat. You can't tame it where you want with this method and you have to protect it and for higher levels it may take more than one bola but it works for me
Easily knocked out when you use a bloa. When stuck shoot in head while you can and itll go down quickly. Tranq darts make the process quicker, but arrows will do the job just fine. They can be picked up and dropped into safe taming cages by argies to make this easy tame all the more easy.