Dogs definitely copy!
I was at the dog park about 2 months ago and there was a Pug/Beagle cross doing the typical Beagle howling. Jackson was staring at him, turning his head, trying to figure it out. And all the sudden... Jackson lifted his head back and let out a big HOWWWLLL! It was ssoooo funny and it sounded identical to the Puggle's. He hasn't done it since, after MY many tries of howling at my dog.
