Adding the hound in pugilist new class

What is the best way to add the hound as an extra in the character sheet? I cannot even find the hound in the list.

Thank you.

Quote from wagnarokkr >>

The Extras tab doesn't have any support for dynamic stat blocks (where the creature's stats depend on the stats of its owner/summoner/etc.) so that's not possible. This has come up a number of times in various different contexts, but D&D Beyond hasn't given us any official word on when or if it'll be fixed.

You can make a homebrew creature that reflects your character's current stats and update it as you level up.

 Thank you!