Dogs will bark at anything

A leaf falling from a tree
bark

The sun rising
BaarrK

The moon
BbaaarkK

Their tail
barK

The force of gravity
bbbbarrrkkk

Their own bark

Bark!
Dog, “What the heck was that?”

Bark
Dog, “What the …?”

Bark?
Dog, “Whaaa …?”

What the hell was that?
Cat, “Who cares. I’m grooming!”