i was told it lives up to a month in the grass so keeping them off the grass if at all possible for the period of a month or 28days is best, i was thankfully able to do this with mine as mum had one pair and dora and arthur were indoors due to snow and the freezing conditions, however had it been the summer im not sure how id have done it, maybe fence off the majority allowing a "run" area then swopping over after day 28? and on day 21 just hosing down with warm water? sorry thats prob no help. x