I'm think that's Angelo, Rinoa's dog

The powers I lend are unique. - No one else has Angelo's skills.
I can come around in your greatest needs, - Sometimes he will use them when you need them the most.
or even at the drop of a hat. - Not quite sure about this one.
My powers come from your exercise, - You learn the skills by "walking" with Angelo.
and the pages that you read. - You enable them by reading Pet Lovers.