The Get In The Bucket Mod is a fairly simple method for easily transporting any mob in the game. It works exactly the same as the current method for picking up mobs that are found in water except it applies to every animal in Minecraft and even includes picking up mobs like skeletons and villagers. This mod also allows you to add entity IDs for any mobs added with other mods as well!
All you need to do for this mod to work is have an empty bucket available and you simply right click whatever you would like to pick up with it. This will place the mob as an item in your inventory and you can then right click again to drop them back out of it.