1. Do only male cats spray or do females do that too? Male cats are the culprit of spraying, but female cats could have litter box related problems too
2. Does nutering/spaying them take care of that problem?if that is the cause, yes. but there could be other reasons
3. Do cats shed alot? YES !!! But it will vary between cats
4. On average for a healthy cat, how much does it cost to get their annual shots and check up? call a local vet, it will vary by geographic location
5. Dogs go on Heartworm Meds every month, is there something that Cats have to take every month to prevent something? no, not to my knowledge
6. On average, how much worth of food does a cat consume per month? (I am not sure what brands are the best, but they would be interested in giving it the price equivalence of Nutro or Eukanuba) better leave someone who only has 1 cat answer this one. It would be impossible for me to tell
7. Do cats claw at furniture, bedding, etc... because they are bored? No, they do it to mark territory. Most can be discouraged to do it on furniture if given the proper insentive to do it elsewhere
8. How easy is it to train your cat to use the litterbox?
any cat should already be litter box trained. All you have to do is make sure they know where it is, and provide enough of them according to how many cats live in a home and how large a home is