I never thought I'd be sewing dog clothing, but our grand-dog Ginger has a bald patch on her back (from a brown recluse spider bite from a few years ago). So she wears coverups to hide the bald patch, as well as to prevent sunburn and skin cancer. Besides, she looks pretty darn cute in her little outfits. This pattern was adapted from coverups that my daughter made - I didn't have velcro, so I made straps to tie in a bow. This coverup is nice for summer - it's lightweight and minimal.
I took these photos a while ago, so I figure it's high time to do a dog coverup tutorial! Since dogs come in all shapes and sizes, think of the first try as an experiment. You might need to make adjustments to make it fit better next time. ;-)
Then take the 4"x11" rectangle and press under 1/4" at both short ends. Then press it in half lengthwise. Now fold and press the edges towards the center lengthwise. You should have a smaller rectangle about 10 1/2" long and 1" wide.