Can you use straw for a guinua pig bedding?

Yes, you can. Line your guinea pig hutch with newspaper, then put the straw on. You can use more or less straw depending on the weather. A bedding of straw and newspaper will need changing once a week. Instead of straw, you could use wool, paper shredding or tissue paper. Instead of news paper you could use thin cardboard, scrap paper or sawdust.