Please help Moose recover

My fur baby,  Moose, has had a cough for a while now. I've taken him to several vets with no success. It took a turn for the worst, he started having trouble breathing, he couldn't sleep, and he looked at me, pleading with his puppy dog eyes, to help him. They originally thought it might be pneumonia based off of his XRAY alone. Since then he has been in and out of the E.R. After countless testing they still have no idea what is wrong. His coughing has lightened a bit but he still struggles to breath. They want to continue to run tests until they can figure it out. It's becoming difficult having to sit by and watch him not feel well. I know that these are difficult times for all of us due to COVID-19. I understand if you aren't able to help financially but every dollar counts and I've run out of options. Please spread the word and help save my best friend. Thank you for your support!