Rudey....if you took that pic, and that was your handy work, you should be ashamed - only three rabbits?

Anyone know if those fox callers actually work? I've never played with them, problem is, where I shoot until I arrive, dogs are running around outside. Put them inside the house, and 30mins later all the rabbits are out, but are the foxes as stupid? Will they still keep their distance despite the calls?