Can rubber mulch be harmful to dogs?

I’m thinking of using rubber mulch as a ground cover for a dog run. Can it be harmful to dogs?


I guess if your dog likes to eat it, it could be.

15 cubic yards of it hasn’t killed my young kids. The local critters and outdoor pets avoid it because it’s not a good place to poop.

Here’s a similar thread from last year. One poster suggests that rubber dog toys will pass undigested, although I don’t know if that extends to rubber mulch.

If the dogs ate a bunch of it AND it caused intestinal obstruction, then yes, it would be a problem.

How big are the dogs vs. how big are the mulch pieces?