They can eat a kosher diet, and be slaughtered the kosher way.
None.
Chickens do not have hooves at all and do not chew their cud. They are however considered to be Kosher animals according to Jewish tradition.
Every Pagan is different.. some are vegetarian, vegan, kosher, carnivorous. It depends on the particular Pagan.
No. Cows are herbivores thus will not harm nor eat chickens. Chickens are also not carnivorous, however they will eat bugs like grasshoppers and crickets, as well as grass and grains.
Chickens are kosher, if properly slaughtered. Jews have traditionally eaten chicken. Leviticus 11 and Deuteronomy 14 provide lists of unclean birds without giving explicit rules. By inference, carrion eaters and carnivorous birds are unclean. The birds permitted for Temple sacrifices are, by definition, clean, since no unclean things were allowed as sacrifices. Doves and pigeons (another kind of dove) are permitted as sacrifices. Chickens behave more like doves than the forbidden birds, so that matches the tradition. Rabbis had to grapple with this question fairly seriously when the European community first encountered turkeys imported from the new world. The conclusion was that turkeys are kosher too.
The Schechter Brothers were instrumental in ending the National Recovery Act (1935) because they claimed that regulations imposed by the NRA interfered with the production of Kosher chickens-which was their livlihood.
These days, mostly chickens, ducks, geese and turkeys. Pigeons are kosher, as are many songbirds. Birds of prey and scavengers are explicitly forbidden, as are flightless birds.
By the time it reaches the supermarket shelf, (kosher meat is also found in local supermarkets), there's not a lot of difference between kosher meat and any other, except that there are several cuts and parts of the animal that aren't available kosher, and kosher meat on the shelf has been drained of all blood. The differences occur before the meat reaches the market. They include the selection and inspection of the animal, and the slaughtering and butchering methods. see the attached Related Link.
It is kosher so long as it is certified kosher.
Fox meat is not kosher. See:More about what is and isn't kosher
It needs to be cooked in a kosher vessel and have kosher ingredients. If purchased, it (or the bakery) should have kosher-certification.
Yes and no. There are many recipes that can be made kosher with kosher substitutes.