Oxygen therapy for animals

[sandman]

Hi everyone, I've just found the forum after being told by the vet, that my 8yrs old manx cat ,Harry,has got a tumour in front of his heart, this is causing inflamation of the heart. After trawling though the internet, looking for a treatment that may work without causing too many side effects, I came across Oxygen Therapy but I can only find info about humans. The recommended application is by using hydrogen peroxide diluted with water and fed orally. Has anyone had any experience of this with animals, not necessarily cats and has it worked for you.
Thank you in advance for any help you may give.
Sandman.