Our cat thinks it is great fun when I am outside, she usually sits near the eyepiece box, maybe she learnt after the very first night I got the scope out. I was walking down the back stairs carrying the tube when I heard this unearthly "reow!" My wife and daughter came running outside "was Cuddles in a fight with THAT other cat again?" "No, I stood on her!" She had sprawled out at the base of the steps. I now turn the back lights on when setting up.
Maybe the dog was waiting for Sirius (the Dog star) to come out