I've just realized I seem to be on a dog kick for several days running here. But really, I can't help myself when I stumble upon things to show you.
For example, today I've found someone who has lovingly assorted many photos of ancient Roman mosaics featuring dogs - with a live dog thrown in.
Many are from Pompeii and Sicily, but you will see some from the outreaches of the Empire: Tunisia, Turkey, Alexandria. There's some from their new homes in the great Western museum collections: the British Museum, the Louvre.
The level of craft and detail can approach a brush's subtlety, and the spirit of a dog in action or at rest is easy to see and feel. Try this post at the Mosaic Art Source blog and see if you don't agree.