The baron gestures for him to open it!
Unwrapped, it has two small biscuits within - one a cookie, and one a dog bone.
The paper has words on it, and a line at the bottom - Holger may or may not recognize the Art of Contract, but he surely recognizes the cadence of an oath.
"Hand to paw, heart to heart, I pledge to you my loyalty. I will teach you and care for you, provide you wisdom and love.
Should I turn you counter your purpose, or raise a hand to you in cruelty, may my sight dim to only black and white, and my voice fall to the yips of a cur.
Should I abandon you, may the dreaming abandon me, until just amends are made.
This I swear, to you, my companion, from this day forth until the day you await me at the Bridge of Rainbows."
The glamour is nascent, present but unfulfilled, ready to be recited to activate the oath.
"This is the oath I would ask of you. Not sworn to me, nor to my house or hold- but to the dog you would take upon yourself. Speak to your liege if you wish, but this is my ruling, if a Silverwolf Guardian you are to take as your own."