Thank you Cynthia, that is just the info I needed. I am planning to take a fecal in to the vet in May when I take my dogs in for their yearly exam and if it is negative, probably won't do wormer. I am still considering this though because I have read that a fecal can be false negative. So, I don't have a definate plan yet. Now, with the info you gave me, I will be ready to make a plan. I really appreciate the advice and willingness to help that you and others on this site offer.