I prefer to spray my yard instead of my pets. I spray the stuff 2-3 times a year and walk the dog the day of the spraying. We don't have low lying plants in the back so I think we're ok with that. I worry about the neurotoxins in the stuff that goes onto the pets not only for their sakes but they sit on our furniture etc and considering DS's Asthma, I take no chances.
Also, isn't there a Lyme Disease vaccine? I think my pets get it, or have in the past.