The most important thing for me when I wrote [Origins] was that at the end even if Morrigan loved the player, she had this thing that she believed in, that was so important that she would do it regardless of the player. And I think that a lot of players expected that she would bend herself to do whatever they wanted because they've done the romance, gotten her approval up, and of course she would just sort of follow their destiny. But Morrigan has her own destiny.
You have to use food motivation whereas a dog will do things for you just for social motivation, praise and petting. Also with any animal you want to stroke it. Don't pat it, stroke it. Most don't like patting.