Your dogs aren’t on something like this?
http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=1460
If not, they should be.
Worm eggs can live in soil for *years* after some critter has passed through, not mention heartworm carrying mosquitoes.
We do give our dogs a heartworm pill though I can’t remember the brand off hand. We get it from the vet.
The feces in the soil bit concerns me not only for the dogs but if the dogs track it in the house. For some reason my yard has become a sort racoon Wilderness Trail with my yard as a refreshment point. They drink my pool water, pull screen mesh away from its frame to get onto my porch where the cat food sits and they even eat the damn cat feces in the litterbox.
And don’t even ask about the squirrels eating my oranges. Although that is one of the funniest things in the world to see; a squirrel running along a fence with an orange bigger than he is trapped in his mouth :)