I had a needle guided sonogram done into the mass and there were cancer cells (squamous cells). They could not operate to remove the mass since it was close to the heart. Luckily it was a slow growing cancer and as far as we knew didn't spread beyond the lung yet.. She went on another year coughing and gagging occasionally and started to lose muscle mass as you describe later on in her sides and then lastly in her head (skull), she was getting a sucked in look.
She was a trooper and wasn't in pain until the end,She would always eat, but sometimes I had to tempt her with different foods.. I had her on various supplements and towards the end on pain med's just to be sure and then on the last day she had labored breathing and I had to bring her to the vet for the final time. She made it to just over 12 years old and she had a wonderful life..I miss her still terribly and this happened last September.
She let me know when it was time and I have no regrets other than I wish I had her longer, even just one more day.
Has your vet done blood work? My Penny was a bit anemic also and her white cell count had been off. We did alot of testing.
Good luck and I hope you have a vet you really like, mine is wonderful.
You should ask the vet to do bloodwork and if he think's her throat and chest should be x-rayed. Give her a big hug from me..Kathy
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