I'm sorry to hear about your trained rat! Those are a lot of work to
train and I'm sure you miss it.
I have it on good authority that there is a better way to run wires,
Chickens! They don't need training as they will instinctively run
towards a light when they are shut up in dusty dark places. All you
need to do is position your assistant where you want the wire to end up
with a flashlight, attach the wire to the chicken (staples?) and shove
the bird above the ceiling. A few minutes later the wire is quite
literally "run". No special training, any old chicken will do! Once
they wear out, get a bad attitude or try to unionize you can have
chicken stew for supper! Truly a win-win situation.