Character from Undertale / Deltarune by Toby Fox
A tiny white dog inside a suit of armor that is approximately 400% too large — the Royal Guard's most powerful and most pettable member.
Greater Dog is a Royal Guard sentry in Snowdin whose combat encounter can be resolved entirely by petting it. Pet it, beckon it, pet it again, play with it — it gets so excited it falls asleep on you. It is a boss fight that can be won with love. The gap between the intimidating armor and the tiny enthusiastic dog inside is one of Undertale's best sight gags. The dog just wants attention. It has always just wanted attention.
What appears to be a massive knight in heavy armor is actually a tiny white dog wearing armor many times its size. The actual dog pokes its head out from the neck hole and pants excitedly. The armor is enormous. The dog is not.