You won’t need to take your rations book anywhere because dog wool does not need a coupon, only a comb.
Now somewhat taboo, dogs as fiber animals was once thought of as a war time necessity. Using dog hair was seen as being thrifty, humane and environmentally responsible, largely because the dog hair was going to be shed whether it was collected by the wooler or not. Below are two British videos promoting the use of dog hair fibers as wool. The first video is from 1942, during WWII – the second is slightly after, in 1951.
Though the links for these videos were provided through Youtube, the British Pathe curates these and more historic videos and other short clips.