Update 1/28: Got the results and it is Spindle Cell Sarcoma. She had surgery to remove several lumps. 2 were benign but the very fast growing one was that.
Just found out last night that our Bella has cancer. What they said so far was Soft Tissue Sarcoma but not sure yet. She has several lumps that appeared. One over the summer but it wasn't an issue at her checkup. A large one appeared almost overnight, within the last few weeks. It swelled up then went down. Now it is back and grew rapidly so I mentioned it to her vet at a dental appointment and got slides run on it.
The lump is on her side over her ribs. She was also diagnosed with a heart murmur last night.

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