the only kind of mulch you can buy if you have dogs is cedar or cypress that has been heat pasturized .A lot you bouy at lowes or home depot in plastic bags will say that .The rubber mulch I saw on the news where a whole playground burned to the ground in seconds because of rubber mulch and teens set it on fire .The treat it for bugs .they have too or the deseases you see in the forest would come to your yard with the bugs .