My 7 year old boxer is puffing her cheeks out instead of panting. She has whitish foam on the sides of her mouth. She seems to be breathing like she's been running but she is just sitting in the den. I brought her to the vet @ 2 months ago with the puffing. She had blood work and everything came back fine. My vet was puzzled and wanted to do an mri. I have no insurance. Is there anything you might think it could be? Do you think I should have the mri done?

