well,they don't eat much,puppies need to be fed more often though,at least 1/2 a cup 3 times a day,adults need about a cup,split over twice a day,it's hard to tell,as it really depends on the size they will be,and even with purebreds,this can be anywhere from 3-10 pounds,just feed them as much as they will eat in five minutes,or how much the shelter/breeder/rescue feeds them,some people let puppies feed freely,esp.if thier prone to hypoglycemia(many young chi's are,though most outgrow it)however,this may make it harder to change later
I am the owner of a chi mix,I got her when I was 10,she is everything to me,but I'll still tell you,a chi is actually one of the most demanding dogs you can get,not really for beginners,they can be wonderful dogs,but are not very forgiving,ex.you step on a puppies toes too many times,they may never want to walk with you again,often one bad person or experience can turn them against a gender or race,thier not the little yippy [bleep]s people make them out to be,but misunderstandings and not handling them and thier personalities right can often turn them into acting as such
with my experience,you may want to get another type of small dog,like a poodle(thier not frou frou's,but they are sweet and smart,the grooming isn't that hard unless you want them to look like a showdog)cocker spaniels don't get that big,and are great with families,I've never met a pomeranian that wasn't a big,tolerant fluff of sweetness,despite thier reputation
it would help if I knew your age,and how your house is(apartment,country,ect.)how big your yard is,is it fenced,ect.It may not seem fair when you come home with good grades,act more politely than your peers,and yet your parents seem blind,trust me,too many dogs go to pounds because parents buy them for kids who get bored with them,or don't understand why they get bit when they've only been chasing and jumping in the dogs face 10,000 times....and sometimes,I've heard of parents buying dogs to "guard thier kids"(a friend of my mom's got a german shepard pup to guard her 3 year old son,the kid tortured the dog,who ended up being put down because he killed the rabbit they had living inside of thier house,I doubt your folks are like this,but again,just cause everyone has a dog,says nothing for caring about that dogs interest)....umm,no,sometimes,things work out,sometimes,you have a bored,hungry dog who doesn't understand why no one's ever home to play,often,the parents do take over the care,but not everyone's parents can,time or money wise,afford to,even if everyone seems to have a dog,just remember that at least you and your family care enough for a dog's welfare to pick through every nook,cranny,and situation before seeing what's best to do
I'm 20,still have no car,nor licence,I could easily say (due to a whole point jump in gpa in 1 semester(in college,that jump usually takes at least a year),and the fact that I have 2 jobs)I'm bursting with responsibility,it still doesn't mean a car would be best right now unfortunately
there's other people that could help you,esp.in the what breed do I want,you can also get a small mutt from the shelter or rescue,tell your mom you can aim for an older dog,it'll come pre-trained and housebroken,and though some people worry it won't see them as "mommy" or "daddy",it will see you as a hero,and will be grateful for such