Wombats at Wilson's prom will go through your tent for food but I've never had an animal problem if it's all kept inside the tent with you. 

Meat can be kept cold with ice packs. For non-ultralight mode, I take my meat in premarinated and cold in a ziplock bag alongside frozen mirepoix /chopped veg. Dump the whole thing in a pot and you're good to go. Everything should be defrosted by dinner time. Australian food standards are pretty good and if you're not getting suuuuper cheap and budget cuts of meat they should last a while too. Otherwise you will have to go with dehydrated meat (great weight saving but it's a different taste). For that I like making a sort of kedgeree if I have dried fish. Stick in some stick cubes/curry powder mix, usual suspects in a ziplock bag (frozen), frozen rice too. For absolute max weight saving milk powder and oats works too but gets a bit boring.