
Not sure they would chew it - or try to dig in it since they
never dig where my childrens play area is (bark chippings down with that black canvas type stuff you put under it to stop weeds coming through). They only dig in soil. Needless to say though, I am not careless enough to leave them unattended and risk their health in any way. If any attempts were made to chomp on it, they would have to go in the exercise pen (on flagged area).
I think you do have to be careful what stuff you buy though - it is worth paying a little extra, since I know someone with fake grass and it honestly looks like the top of a snooker table - exactly the same colour and just as flat (very practical with dogs though !)