The sentry bot toy is a miscellaneous item in Fallout: New Vegas.
This little guy is really small. If you interact with him, it will add a sentry bot toy to your inventory. You can also deactivate the toy. He'll follow you everywhere, through regions, and he can open closed doors. If you attack him he will just run away. Kill him and pick him up and you'll get a broken version. Graphically he's identical to the regular sentry bot, except 4.5x smaller. He's somewhat noisy when he rolls around. When the sentry bot toy is stationary, he will do different stances with his arms, like a plane checking all flaps right before take-off. A good side companion but he can't fight. But he makes up for it by being completely adorable (for a robot)! He also happens to be very useful in the fact that he often draws enemy attention away from you during combat, and you can increase his health via console commands, or just pick him up before harm comes to him.
The sentry bot toy was cut from the final version of Fallout: New Vegas and is only available through the use of console commands.