Since I had kids in cloth diapers lo these many years ago I have used good ol 20 mule team Borax in the wash water for odors of the organic kind. I've not had to use it on dog pee but dog beds get a strong acrid doggie odor and it works beautifully on their bedding. I'd give it a try.
I am a pre washer so I wouldn't hesitate to wash the rest of the bolt and get on with my project. If you like the body in non washed fabric give it a light dose of starch. I often use it when cutting on the bias. That needs to be rinsed out after the project is complete or the bugs will get it.
Jane