Temporary Nanny Needed For 3 Year Old And 15 Month Old

We are looking for someone to care for our two girls 2-3 times a week starting in April through at least end of May, with potential to continue beyond then. The days of the week are somewhat flexible. We are looking for someone experienced with toddlers/preschool age, active, fun-loving, and who can think of activities to keep them busy. We do have dogs in the home, so must be comfortable with them around. Their grandmother also lives with us and would be home often on the other side of the house, so must be comfortable with that as well.