Well, we got good news and bad news. The good news – FANTASTIC news – is that Tucker does not have hemangiosarcoma in his heart, which is the thing I was too sad and worried to even write about before. Fortunately, his heart looks relatively healthy, if somewhat enlarged due to his anemia. The bad news is that we still don't know what's wrong with him. His spleen was enlarged, so the vet did a biopsy even though the spleen tissues appeared normal. But better safe than sorry.
So, we're sort of back to square one here. If his biopsy shows irregular cells, that'll suggest that his spleen is causing the problem. But if not ... well, more bloodwork. The blood they took today is being sent out to try to determine if his anemia is degenerative or regenerative, and we'll find out if he's getting better, worse or remaining stable.
But for now, he's home and comfortable and at least we don't have to deal with the worst-case scenario. Bullet dodged.
Thanks for the good thoughts, everyone.