what type of grass for play area

[shell]

i am planning a play area that the dogs dont go into,i was looking at recycled rubber chippings but the are too expensive for what i need,so i thought of grass.now i remember reading a while ago about tough grass for area`s that get a lot of wear but cant remember where,any idea`s for this or suggestions?the area is 30 metres by 6 metres, and it has already swings and tp climbing frame ,

[jenko]

dont know what type of grass, but you could get that hexaganle rubber matting which grass grows through, like what they have in car parks and other places

jenko