Fungus problem in lawn...
 

How do I eradicate mushrooms in my lawn? I have been getting an escalating problem over the last two years. This year we are getting more, and they are getting bigger. I used Spectracide last week, and we got a whole bunch more several days later. So, it didn't work.

How did they develop, and how can I ever get rid of them. I have two dogs, and need to get rid of this problem in case they are toxic.