Most of the dog boots created are made from soft and breathable fabrics that allow hand washing or regular washing. Rubber boots, as well as the ones made of mesh or socks made of cotton, are the safest ones to wash after every use.
When it comes to fleece booties or the ones specifically designed for winter, it is best to read the instructions provided by each manufacturer. You should avoid washing leather or suede boots and only clean them dry, using a damp cloth and special leather care solutions.