Physical Strength: Muscle-power, brawn, you know what I mean.

Physical Defense: Defense against physical attacks.

Magical Strength: The intensity of spells cast by your dragon. This also applies to non-offensive spells, such as healing. The higher the MS, the more effective a spell will be.

Magical Defense: The way in which your dragon is affected by spells cast upon it. The more MD, the more resistant the dragon is to belligerent spells.

Agility: affects both the speed and dexterity of your dragon. The higher the agility, the faster and more flexible your dragon is.

Endurance: Essentially hit points, how much damage your dragon can take, as well as how long it can keep up physical and magical activity.