Foster Dog Bella Needs a life saving operation owner wanted her euthanised

Bellas owner was going back to the Uk I took her on as a foster dog as she was un speyed, i was going to Spey her and was advised she was 100% in perfect health, on arrival I noticed a lump, with which owner said was a hernia by text, on taking her to the vets to get her vaccinated my vet told me she has a mammory lump and needed it removed, and potentially a mammory strip and rotten teeth removed, also X-rays and hernia removed. they reckon she will have a great recovery and will live many years with this op. Bella is only five, we contacted her owner and her response to both myself and via email to the vet was to euthanise her. No compassion, wasn't upset, well I am upset Bella is a delightful girl, and deserves to live! She is cuddly well behaved and loves life! We are looking for some help towards her operations as Both our vet and I, think she deserves it. And we are all upset by the owners response. Donators are most welcome to email the vet. If more money is paid than the vet bill then the rest will be donated to another dog organisation.