Decoy Dragons Mod is rather small and provides a number of small dragons which can be tamed and used for some purposes. This mod includes specific dragons based on biomes, for instance, it is impossible to find an ice dragon in a desert. All of the dragons which have been added so far also have a specific taming item that works for them, and player can tame all of the dragons by using their items, so there are no broken items or impossible dragons.
Interacting with your tamed dragons is easy enough. Right clicking them will have them sit and stay in one location, or get up and start following you around, much like a tamed wolf mob. Unlike wolves, the dragons are completely immune to fire damage and they also cannot drown in water, so they’re pretty much invincible against any liquids Minecraft has to offer. That means you can take them swimming with you in the Nether if you gulp a fire resistance potion first. The dragons come with their own unique tier systems as well.
The Decoy Dragons Mod focuses on a special type of ore called rainbow opal. Chunks of the ore work as a taming item for the weaker dragons in the mod, but you need to use pure rainbow opal gems if you want to have any chance at catching the more powerful and venerable types of dragons in the mod. Decoy Dragons took a lot of inspiration from the DragonCatcher mod, and you’ll probably see this for yourself if you’ve tried that mod in the past. It is by no means a copy though – this mod is packed full of unique dragon content.
for Minecraft 1.7.10 – Forge Required
Credit: DecoySoftTeam – Original Thread on Minecraft Forum