Domesticated Dinosaurids

Compsognathus are often kept for their eggs or as pets. They can be quite affectionate and enjoy having their feathers brushed, but do not like water.
Velociraptors are valuable family guardians and are often kept as pets or to assist hunters with their keen sight and scent.
Deinonychus are trained as mounts for smaller ancestries that can also serve as deadly trackers. Goblin Deinonychus cavalry are terrifying to behold.
Hadrosaurids, including Parasaurolophus (parasaurs) are the primary livestock for many cultures. They are kept on large pastures or in nomadic herds for their meat. Due to their immense size a butchered Hadrosaurid is usually shared among a community.
Stegosaurus are some of the earliest domesticated dinosaurs as they are generally good natured and easily baited with shiny objects. Stegos, or their smaller cousins, make good pets and when trained well can be effective guards.
Triceratops are exceptional draft animals. They're employed whenever heavy loads need to be moved, from hoeing ground to siege equipment to powering winches. Trikes are especially valuable for hauling lumber from forests to mills or waterways and for moving stone.
Sauropods, such as the brontosaurus are rarely kept, but herds of wild sauropods are sometimes escorted by nomadic tribes. These beasts are so enormous that steaks can be harvested sustainably with a small application of healing magic.
Terror birds and shrikes are large flightless feathered dinosaurids that are trained as fast mounts that are also capable of defending themselves as a pack.
Pteranodons and Quetzalcoatlus are flying pterosaurs that are sometimes tamed and used for scouting or message delivery. Due to their light structure, large pteranodons can only carry small passengers while Quetzals can carry up to medium creatures.
Rocs are the largest flying creatures that have been tamed. Trained Rocs are very rare but are incredibly valuable for transporting large goods long distances.