My Dogs Are Barking

I spent today and yesterday driving Toyota Tacomas off the production line and over to the shipping area. Then walking back to do it again. I estimate I walked 15 miles each day.

I told a coworker "my dogs are barking", and they laughed at my choice of idiom.

One source says that the use of "dogs" for "feet" comes from "dog meat" which rhymes with "feet"(1913). Another source says "dogs" for "feet" is Jazz-Age slang(1920's). So the idiom is quite old.