Brando growls a bit, and begins to quickly wag his tail instinctively. He hopes to it's enough to tell his friends to back off from the door

He prepares to charge. Legs bent, about to initiate a small spring

And so he does. As he approaches the door Brando jumps, poucing into the door with all his might

Spoiler
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Attempt to break the door, currently, my Might is Great (+4). Hulking Size adds +2 to attemps to break or lift and another +3 from Inhuman Strength (if they stack)
So, Might at +9
(4d3+1)[12]