We shot a few ducks with sarcocystis (rice breast) in Nebraska and we never thought much of it. Just cut that stuff off and made jerky out of it. To me it seems ridiculous to waste an entire breast that isn't harmful to humans.
Here's some info about Rice Breast
As far as lice go, I have shot a lot of ducks with lice, but don't think that they would infect a dog unless the dog had them for a good while. Lice that are found on waterfowl can not jump and usually won't stay in animals with hair - the feathers are a better protecting agent for them.