Why oh why didn't he spay this dog?

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I'm heart-broken, the sweetest Pomeranian I've ever known is possibly dying. She's only 12 which although a good age isn't old for her breed as they can live 15-18 years. She's not my dog but I've looked after both her and her disabled owner for 5 years and so feel very attached to her. She's had a disease called Closed Pyometra and needed to have an emergency hysterectomy (a very difficult and dangerous operation in these circumstances) but the infection has spread to her Kidneys and the Vet is now talking 'Euthanasia' She also told me this was one of the most common causes of death in an older female and by the time the dog shows signs of illness it's often too late! Whilst I was at the Vets I noticed their price board. A spay before heat £80 after £160. Expensive I'll admit however - The operation alone cost £1,600, with x-rays, medications and hospitalisation adding another £400+ he could have saved himself a lot of expense and a great deal of heart-ache. His reasons for not spaying, he wanted her to have a litter and as she got older he didn't think it mattered! He thought it wasn't worth putting her through an operation then! I feel so angry with him and I'm not sure how I'm going to be able to support him if the worst happens tomorrow! As a dog/cat owner for 50+ years I've lost my furry companions to old age or disease but this just seems so cruel!