Rubber mulch is considered dog friendly. It is generally safe and non-toxic for pets. Tests have shown that the mulch should not react adversely with digestive acids if eaten. (That said, it's better for dogs not to ingest it.)
About this Author
Alice Moon is a freelance writer with more than 10 years of experience. She was chosen as a Smithsonian Institute intern, working for the National Zoo in Washington, D.C., and has traveled throughout Asia. Moon holds a Bachelor of Science in political science from Ball State University.