Do you actually buy dead mice, Nik?
Yup! They're super expensive from Petco, so I buy from various sites (Rodent Pro, etc.) that sell to snake keepers. I'll admit, it REALLY grossed me out at first but I got used to it.
I also let them outside occasionally for some "self serve" mice. ;)
I don't feed either my dog or barn cats a raw diet (can't afford it), so I'm not sure just what kind of animals are used.
I feed all kinds of meat to my dogs: chicken, turkey, beef, pork, venison, rabbit, etc. Their "staple" is chicken leg quarters, cause they're cheap and convenient. Plus, they contain kidneys so they're getting a portion of organ meat with every quarter. I tend to feed a lot of pork because it's cheaper than beef. I put up ads on Craigslist for free/cheap meat. When people are cleaning out their freezers I get a lot of free stuff... sometimes a hundred pounds at once. Venison is the absolute BEST and I get a lot of that just before deer season, when people are getting rid of last year's kill to make room for this year's kill.
When I get a lot of free meat, it's actually MUCH cheaper to feed raw. When I don't, it's definitely more expensive. A lot of areas have "rawfeeding coops" and then it's much cheaper. Unfortunately, the closest one is several hours away and it just isn't cost effective with the price of gas.
I will feed kibble if I haven't gotten free meat for awhile... grain free Acana, Earthborn, etc.
Actually, dogs are not carnivores, contrary to what many may think. They can, and will, eat and digest fruits, veggies and grains perfectly fine. Good carbs come from the healthy grains. Wolves are carnivores, domesticated dogs are not. Their digestive tract has evolved to digest other things besides meat and bones.
There's a lot of debate about that... the Yahoo rawfeeding group (20,000+ dogs being fed a raw prey model diet) definitely feels that dogs are NOT ominvores. They are absolutely opportunistic and will eat just about anything put in front of them... my Rottweiler enjoys cardboard.
Cats are definitely obligate carnivores but some will STILL eat anything. One of my cats LOVES hot dog and hamburger buns. He will go through many lengths to get them. He got ahold of a bag once and chewed through it and proceeded to eat FOUR hot dog buns before we caught him. Crazy kitty!