S.L.
M. the only thing that keeps ticks off my dog is a tick collar. The problem is, that small children (toddlers) and pregnant woman cannot touch the collar. YOu could put it on the dog when not around the children and then take it off when around the children.
An all natural option is to plant lavendar around the perimeter of your property that will keep the mice, moles and deer that carry the ticks out of your yard.
And finally if you have big prperty buy a couple of ginuea hens (or chickens) let them loose in your yard; they eat the ticks- my dad does this for his dogs and they are pretty good pets too.
Good luck!