Good question. If House is to be believed, we have the ability to display mental images today, provided we can calibrate first. Calibrating with critters doesn't work so well, because you can't say "think of a ball". But maybe with controlled stimulus you could get somewhere. And it's early days yet for this technology.

One day, maybe we can watch dogs dream. :)

Someone call Leonardo DiCaprio!

If you've ever looked at the similarities in how humans and animals behave in sleep it is obvious that something is occuring within their dreams. Humans twitch and move while they sleep; animals move and twitch while they sleep. Humans have a more developed sleep paralysis function but I have found myself thrown from a dream and have woken up standing upright beside the bed. Something in a dream told me to do that. In all likelihood, an animal needs sleep for all the same reasons that a human does and the goings on within their brains are similar to those in ours, tempered by their perception of the world. I won't say their perception is less sophisticated than ours, it's just different, and so, their dreams are probably different but analogous to ours.

We are mammals; foxes are mammals.

hard to say. the commenter above said it all, I think. I have watched our GSD dream, and she even yipped on occasions. sometimes her dreams were so vivid she startled awake from it, looking confused for a few seconds...

The soft blue tint in the fur are just so precious- and really makes a wonderfully artistic color pallet. XD

Thanks...I was intrigued with how that happened in the photo.