My dog Daisy is 7 years old. She has like this ball inside of her stomach. Not like a small ball , but more like she swallowed a basketball. Its on the sides of her stomach. My mom fears is a tumor, but we are not sure. We can't take her to a vet because all the types of exams and x rays and probably surgery she has to get are too expensive. Also she breathes very heavily, like she is out of breath. She breaths like that all the time even when awake.

It sounds like some kind of obstruction; but what do you intend to do, she must be uncomfortable with difficult respiration? How do you know what needs to be done is too expensive? You could at least take her for an assessment and go from there. Your pet is only 7 years old.

I don't know why you bothered posting, we can't diagnose anything here on AMHD, it just cannot be done on the internet, and even if we could, what would you have done then?

I think you would be wise to spring for a physical exam at the very least.
With a good history from you and actually being able to see, listen to, and feel the dog a vet may be able to give you a good idea of what you are dealing with.
An exam should not be that expensive, let them know going in that finances are an issue.
Two things that come to mind are heartworms or a tumor, of course there are other things it could be, these are just guesses.
You should take her in and have her checked.
Please let us know how she does.

I agree with Tickle and Sam.

I have to ask, if we had said "Yes, it's a tumor, it needs to be removed", what would you do?

I understand that the vet can be expensive, especially if there's a major issue, but there absolutely nothing anyone on the internet can do to help you. You have to involve a vet in this.

At the very least find out if this is cancerous. Then you'll have information to go by, and you can base any further action on that information, be it putting up the money for surgery, or euthanizing the dog to prevent further suffering. But without knowing what you're dealing with the best you can do is watch her suffer and hope for the best.