Bulbdog
This is a dinosaur that has 700 health and eats raw meat. It can be found all over the place, so chances are you have already seen it.
To catch him, simply scan the area until you see a tiny passive dinosaur, and then begin the taming process.
Find an aquatic mushroom and place it in the tenth slot. Now climb the Bulbdog and press E to tame him. That's pretty much all you need to do. Remember to feed him raw meat because you clearly don't want him to die.
It is worth adding that Bulbdog can find maximum level creatures in the neighboring area and enemy players. Both of these abilities are automatically enabled.
Ravager
They are hunter dinosaurs that usually move in herds of three or four. One of them will always be larger and glowing - this means that it has the highest level.
Once you have tamed the glowing Destroyer, the remaining ones can also be tamed, after which they will follow you in a pack. This way you will be able to hunt in the herd.
If you want to tame the Destroyer, first knock him down and then give him some meat. If you don't have enough meat in your inventory, you must first kill the sheep.
Feed him enough meat and he will be tamed. Before you can ride it, you'll need a saddle, which will become available at level 47.