Fear of Mad Dogs (Deliricynophobia)

Pursued by a madly barking dog, Figaro races towards his house.
In the mayhem, his own robotic dog, Rivet becomes dysfunctional when the light bulb in his robotic brain burns out. In the repair kit there are four different coloured bulbs. Figaro is unsure which one to use and decides to just try them all!
The first bulb causes Rivet to be as dumb as a box of hammers; the second bulb turns him into an instant Casanova; the third bulb is even worse as it turns Rivet into the thing that Figaro fears – a mad dog.
Will Figaro be able to replace this 'mad dog' bulb, or will his fear overcome him?