Mileys operation to remove tumours

Hi my name is Bronagh and this is the last thing I wish I was ever doing but I’ve no option but to ask for help, my wee dog miley recently had a lump growing on one of her nipples, we took her to the vet and they said it was nothing to worry about as it was just an over flown milk duct but over the weeks it has gotten bigger and I’ve seen her deteriorating so I’d no option but to take her back to the vets and they done scans etc and have gotten back to me now saying that these lumps are now cancer tumours and that it’s going to cost £850 for the operation to remove them and if not then it breaks my heart to even write this miley will pass away, anyone who knows me or miley knows the love I have for her she’s my absolute world and has been there for me and helped me through things that you wouldn’t even imagine, this is my last hope anything atol would be very much appreciated ❤️ thank yous very much