I should take a minute to answer a few questions.

but I must ask why you have decided not to use chemotherapy since cats do well on it, usually, and don't have as many side issues as humans
Well, I don't really know a whole lot about CATS and chemo........but I know it makes humans feel badly but we can understand that we must feel bad in order to get better. to me an animal only knows he now hurts WORSE. Besides all the people who HAVE done this with their pets only to lose their pets (AND all the money too). And many say they will never repeat the insident for another pet.

, I wonder WHY the specialist thought that chemo would be the option????
Because it is multi systemic it is most likely mast cell cancer. I was told that this doctor is VERY blunt, so if he did not give other options he probably felt confident that this is the only way.

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I won't make the promise to do "everything possible" for Lucas, because I do not believe in those types of heroic measures, but my vet sounded confident and hopeful that this can keep him comfortable for more time than if we did nothing, which makes it worth a try.