I'm so sorry to hear your furbaby is having troubles
My old jack russell went through her third surgery for tumor removals (had two surgeries this year and one 3 years ago) and we were told it will definitely come back, but since she's around 13 we are just hoping the next time won't come around too soon and it ruin her quality of life near the end. But interestingly enough she's very bouncy and acts like she's got years added to her since her second surgery and pretty much acted like she didn't have surgery the last time. Which surprised the vets too, cause usually dogs would limp or act sore etc. but she just ran around like it was nothing
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R.I.P. Mick & Mandy (before 2010), Mila - 4/3/15, Chloe - 2/18/16, Kimchi - 6/2/2021