Vaginal tumor in a dog

A female dog,Biscuit, 13 years old was brought to the clinic with this growth. It was a bad case of Vaginal tumor and only treatment for such case would be Surgical excision. But it was risky because of age, size of tumor and physical condition of the dog. Even the owners were not ready to take any risk and wanted to leave the dog. But counselling was done to make them understand that leaving is not the solution and after all they cant leave the dog like this as she may go in depression and the condition can deteriorate. they understood the fact that now it was their duty to look after the old dog, when she needed them most after serving for so many years. Finally Biscuit went back to home..........
HOW ONE CAN ABANDON THEIR COMPANION LIKE THIS. SOME CAN DO THAT AS THEY CAN ABANDON THEIR OWN PARENTS IN OLD AGE HOMES THEN WHAT AN ANIMAL MEANS FOR THEM?