Check the link below... scroll waaaay down to the section headed "Dogs." You'll see two links of interest...

greyhound boots
dog booties

Both links have good information.
I'm sending you to this Free Sewing Patterns link instead of directly to the two individual links because I thought you might be interested in the other dog clothing patterns there.

I made a coat for our shorter-haired pup last weekend, using fleece on one side (inside) and a supplex-type material on the outside as a windbreak. We treat our little furkids just like members of the family, too!

Let us know if these patterns will work for you. If not, I'm sure someone will come up with a better source. And if you make them, let us know how they work. (I've tried commercially made boots for our pups in the past and either they were difficult to get on, or else they wouldn't stay on.)

Here is a link that might be useful: Free Sewing Patterns