Pitbull eating disorder?

I have a 7 month old pitbull and she wont gain weight and i let her eat as much as she wants. she is only about 40 pounds and she is not emaciated but i can see her hip bones and the vet said it could be worms but i have given her all types of wormes and she has been vaccine and i even gave her vet wormers the directions were to give to her every 3 weeks or week if very bad. i issued it every day until it ran out and that was about 9 days and starve her for 3 of those days. when i fed her she didnt eat anything and i fed her the next day after that day and she ate alot but she used to not eat much(about 2 cups) before i gave her the medicine but know she eats more than 6 16 ounce cups of dog food a day if u need more info just inform me in your answer and leave your email and i will give u the info. thanks and pray for my dog and i. Gods good Whats a good treatment for mange. Please help!

female 7 months perfect wieght a full grown female pit should wiegh any where from 40 to 50 pounds a male should wiegh 65 pounds max. pitbulls are a very very lean breed and very lean muscled if you want your dog to be bulky then you should have gotten an american bully instead most people think they are pits but they are most definately not and wiegh any where from 80 to 100 pounds depending on gender. at 7 months already being 40 pounds for a female pit id say that pushing it a little most female full grown american pitbull terriers are 40 to 55 pounds. pits are meant to be lean and light but extremely extremely strong if they werent then they wouldnt have been bred to be the ultamate fighter or all that bulk would slow them down ya see. my friends female pit wieghs 57 pounds he wieght pulls her for fun and exersize her max she can pull is 2300 pounds of course that is nothing to what pitbulls that are in regular competitions can pull though but its a hell of a lot more then we can!

what food do you feed...
and no the hips arnt "big"
i remember a pit/lab i fostered for a few months that would not gain but a few pounds...so i took her to the vet, her metabolic rate was faster that what we could feed her, he told me to feed her a 1/2 cup of brown rice with every meal and a raw egg, every 2 days ...around a month later her weight popped up to 75 pounds, and i laid off the egg and rice mix

Take your pup to the vet it may need high calorie food or could have a parasite.

Some dogs are just skinny.

Your dog is just the right weight. Seeing her hips just means she has big hip bones.

You're right, you should not be able to see the hip bones in a dog. She should have nice muscle over her hips. Try exercising her about 30 minutes after she eats (either a nice 30 minute jog, or an hour walk) and keep track of what color her stool is, how 'together' is it (is it one piece, several hard pieces, or runny), and how much she goes. Treadmill is good for this, too. Muscle is heavier than fat, and is healthier for her to have if you want weight on her. Thing is, the American Pit Bull Terrier is a medium sized dog, meaning it can be 30 lbs to 75lbs depending on the height, length of dog, size of bone, and what lines she comes from, then male or female, males being larger. So 40lbs, unless she's a giant specimen, is not unhealthy at all.

You might consider calling your local dog pound or SPCA and ask about low cost Vet care clinics. Some shelters offer this. Some spay and neuter clinics do as well. Not sure why you starved her for three days. That's the problem with suggestions from people that mean well. Sometimes home remedies cause more problems than they cure, or can be harmful to animals or people. Has she been checked to see if she is heartworm positive? OTC and Vet de-wormers do not treat heartworms.
As far as the mange goes, one kind is not contagious and another is. Both kinds need Vet product to treat effectively.
Early treatment means less expense in the future. I have seen too many dogs get much more serious problems as a result of well-meaning people who tried to treat their own dogs because their finances were limited. The cost was the loss of their dog, either by giving it up to a shelter, or the dog got sicker and in some cases, died.
So I hope the suggestions on trying to find low cost care will help you to find some place that you can afford to take your dog.