yes, animals will dig your soil up lookin for whatever smell that bloodmeal is giving off, its happened to me before. the best way to do it is to put it out a few weeks before planting so whatever happens doesnt destroy your roots?plants, and then the animals will leave it alone after investigating it. i use chicken shit, it has loads of N, and animals dont mess with it. i also recommend cow manure, my theory is that, why would any animal want to eat shit! bone "meal" and blood "meal" are just that, a "meal" its used as feed for farm animals, good thinkin on your part, it sucks when you go to your spot and your little babies are torn out of the ground and layin next to a big hole. good luck buddy!