cows go moo..... warp and woof

In weaving cloth, the warp is the set of lengthwise yarns that are held in tension on a frame or loom. The yarn that is inserted over-and-under the warp threads is called the weft, woof, or filler.

weft - a yarn used for the woof. i.e. a crosswise filling thread in the fabric

The warp and the woof of woven cloth run at right angles to each other.

A dog's bark is sometimes written as "woof" or "woof woof" (another typical written form is bow wow).