Soggybagel

Well I've searched the forums and seen that there are a couple posts on ant control...problem there is a rather large ant hill/blob growing in my back yard and am too poor to get rid of it through professional means. I dont want to kill the grass (some can be killed if nessacary) but also I have a dog so I would prefer if I could do this and have him back in the back yard with in a day. Just want a good way of getting rid of these bastards once and for all.