Well, usually when princesses are locked in towers they have some sort of curse or are otherwise defective in some way. Considering this princess was... actually a prince, most would consider that a major problem. It wasn't for a lack of trying though, the King and Queen had done their best in educating their son in a variety of things. He'd learned dancing and sewing as well as far more useful things like swordplay and how to recognize poison when he saw it.

Giant dogs though?

Not so much in the training, especially when they kidnapped him in the middle of a rather nice sleep in a comfortable bed.

Congratulations Rufus, you have the Worst Princess Ever on your hands now.