Fuzzy Raptors. Why would you not love them? I attemtped getting one once... I hatched it with a few(like 13) campfires. It lasted long...enough. It died by a Allo. So thats 1 down. I tried again this time hatching 2 at a time. They starved(3 down). I tried another time only hatching 1 egg and I got twins. They died in a raid(5 down). I was DEDICATED to getting at least 1! I raised it and she was beautiful. I named her Mary Hoppins. Soon I hatched her a friend. Her name was Floof. Ohh the adventures we HAD. She died in a raid like a week later.
You can't tame these guys by knocking them out. Instead, you need to steal their fertilised eggs (just like wyverns and rock drakes), hatch them and raise them, just a bit harder than knocking them out. The eggs can, of course, be found in their nests and do be careful while trying to steal one as the Deinonychus is very territorial. Hope this helps :)
Here's how to steal one early game: If you spawn in at chalk hills 3 and spawn next to a pond walk opposite to the pond. There are some nests right there. Snatch one quickly and run off the cliff next to the pond. Be careful and make sure to fall into the water. From there make a left and you should get to a beach area. From there it should be easy to find your base.