I had a particular fox problem whenever I used blood, fish and bone (so much so that I had to stop using it.)
Pelleted chicken manure seems to result in a few holes as well but they do seem to work out fairly quickly that it tastes like you-know-what!
Since autumn I have had regular holes being dug, always in the same small area, and as far as I know there is nothing in there to arouse their interest at all!
I have found that just laying plastic netting over planted areas seems to deter them, although if yours go round trashing brassica netting you may find that doesn't work!