My dog has recently been diagnosed with hookworm (very mild infestation for which I am treating him). Although I walk him regularly and always clean up, occasionally in the winter months he leaves feces in the backyard, which I find when getting the garden ready for spring. What should I do about potential contamination? I have grandchildren and also tenants with young children. Is it necessary to have the lawn resodded? would that solve the problem? Thank you.