Boing-Boing the Bionic Cat and the Lion's Claws — Larry L. Hench

The story of how Daniel -- who loves cats but it very allergic to their fur -- has a bionic cat built for him by his neighbor and engineer, Professor George. Boing-Boing is just like a real cat, but with fiber-optic fur, computer-controlled joints, electronic eyes, and ceramic-sensor whiskers. When the friends visit London's famous zoo, they have a hair-raising encounter with a lion who mistakes the bionic Boing-Boing for lunch.