[simongr3dal]

See if you can't get a steel armored fiber cable, try to get the ones that are essentially a cable wrapped in a thin narrow sheet of steel. They are pretty common for electric cables to prevent accidental damage and to prevent rats from chewing through the cables.

Alternatively there are nail polishes for sale that are supposed to stop nail biting by being very bitter tasting, maybe monkeys also find the compound very bitter if you coat the cable?