Shelties are in the top ten easiest dogs to train, and they get the trick right in their first five tries. If the trick has more than one step, it will be harder for the sheltie but he will get each step right quickly.
Shelties are very smart. They are the 6th smartest dog breed and can learn every trick.
Shelties also enjoy doing puzzles and nosework.
Shelties are not mouthy dogs. When they are young, just like all puppies, they teethe.
Shelties do not have a large prey drive, but get excited around squirrels. However, they can be trusted offleash.
Shelties are talkative dogs. If you want a quieter sheltie, you must train him to not bark when he is young.