She is almost 18.
She has hyperestesia, arthritis and kidney failure.
She was diagnosed 7 years ago with the first illness and 17 months with the latter ones. She is doing really well though. Still plays, has seen off a fox and fronted up at some dogs - one who was much bigger than her 
.
Last night I felt a lump and so took her the vet this morning. It is either a cyst or breast cancer 
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She has had antibiotics and will be seen again next week. Best case it is a cyst and she will be fine. Worse case is it is cancer and then there is nothing we can do and I will lose her . Because of the problems with her kidneys she wouldn't cope with a GA so wouldn't be able to have the operation.
I am worried sick, really upset and would like some advice please if anyone has gone through this.