SR4 handles drones a lot less efficiently than SR3, as the tables and rules are scattered over (almost) all source books. I used to play riggers only, but quit playing riggers when we changed to SR4 so I'm not proficient with them anymore.
From my SR3 experience, I'd expect a bear drone to have a modification called "robot arm" - better have two of them, plus legs (best start with a walker drone). This modification comes with a rating that is equivalent to any attribute for tests, i.e. strength as well as dexterity (<- is that correct back-translated, not using the English rule books). You can add modifications that raise Str or Dex as well as any cyberarm/-hand modifications, i.e. (finger)nailclaws (<- backtranslated). In SR3 there was a lot of capacity and weight calculation behind this:
- First for putting the arms on the drone, then for putting the mods in the arms.
- Each for both weight and capacity
- Each for both max and current ~
The process seems to be streamlined in SR4, but as I said, i'm not proficient in the exact rules.
BTW. usually players can't design completely new drones. They buy stock and modify them. If you want to allow a drone like that, I'd have the player make up a backstory of why someone built that drone the way it is.
- Who designed it?
- Who built it?
- Where? What resources were used for development, manufacturing and assembly? (Remember, it takes facilities comparable to R&D-department plus factory to built stuff from scratch.)
- What's its original purpose, e.g. pet drone for an eccentric rich or from a theme park?
- Where can you get spare parts for repairs from?
- How did the PC get hands on it?
- Is someone out there looking for such a recognizable thing, e.g. was it stolen?