You might want to look into "Cell Food". It's a liquid supplement that increases internal oxygen supply by increasing oxygen in the body at the cellular level. I just started giving it to my dog who has breathing problems due to allergies. It's expensive- $20-22 for 1 ounce but I thought I would give it a try. I don't know if it works yet because I just started giving it to him last night. After his first dose, he did seem more energized than he has been.