It would be cool if your dog could retrieve an item(s) once per day. Could be locked behind a uni class. Item quality, success rate, etc could be tied to dog quality, loyalty, and experience ratings. For example, maybe it retrieves 1 coke on the high end, or a couple fertilizer on the low end. 

Would be cool if new junk items came into the game from this also, would be funny to send to other players to be toxic/funny birthday gifts etc 

Buddy bought you back 1x Used Condom, from roaming the streets of La Paz.

You sent x1 Used Condom to SAGE.

This would be quite a fun addition and make having more than 1 dog viable too!