Not sure about dogs or other stuff, but here some ideas I had today:
- Robot villagers have solar panels on the top of their heads, threads instead of feet and mechanical claws/pliers for arms.
- On the front they have similar symbols to galacticraft machines, like metal compressor, furnace, circuit fabricator etc
- Basically they trade stuff related to their symbol, so a compressor robot takes an ingot+"money" and gives it's compressed equivalent, the energy storage robot refills batteries, etc
- "money" could be wafers, or just emeralds