500g rolled oats (the real ones, not the instant breakfast oat flakes)
500g Tuna (canned)
1 tablespoon dried parsley
preheat the oven to 350F --- Mix all ingredients together until you have a thick paste and spread it on a cookie sheet (maybe 1/2" thick) --- put the cookie sheet in the oven for about 10-15 min and then take it out --- now I use a Pizza wheel and cut the dough into 1" wide stripes (makes it easier to break into pieces, once the cookies are done) --- then back into the oven for about 40 min --- now turn the oven off and leave the door a little open (I put a wooden spoon in the door)--- let the cookies cool down inside the oven for about 2 hours---after that they should be nice and crispy and you can break them into pieces
I keep them in an air tight container.
Instead of tuna, you can also use pureed chicken liver! That might take a little longer in the oven though!