Mech Pilot who found something bigger, faster, and more slobbery to work with.
"Rusted up sir, the planet's acid rainstorm was harsh. But luckily when I took shelter in a cave there wa- Woahhh, easy there!"
BARK BARK
"It's ok! Good boy, good boy. Sorry sir- that was to him not you."
"CORPORAL. We have rules and procedures for a reason, this is unorthodox and untenable. You will stand down, so you and that thing can be properly reprimanded."
"Sorry for the correction sir, but I have actually read the entire manual. And it's fascinating, there's nothing in the rules that says a dog can't be a mech."