I’m sorry but I don’t agree with this.
We recently lost a very old dog (also a pointy hound). He’d been ill for quite some time with several chronic, but not ultimately terminal, health issues and we wanted to be sure we made sure he was pain-free, comfortable and happy in his last few months. He was seen by the vet regularly and we had lots of discussions with them about how to know when the time is right. The most important thing they impressed on us is that eating and drinking is no indication of welfare. The vast majority of dogs will continue to eat right up to the end, (unless their illness is something that actually affects their stomach/digestion).
Dogs are incredibly stoic, they don’t show pain like we do and when they do it usually means it’s significant.
Our vet advised us to think of a time in the last few years when he had a good quality of life and was really happy, then compare that quality of life to what he had left. Decide which things gave him the most joy/happiness to give him that quality of life and which ones he honestly wouldn’t be happy without. They also suggested writing a list of ‘absolutes’ ie events that would be mean no more questioning ourselves (for us it was things like not being able to get up on his own, becoming incontinent, clearly in pain that we couldn’t control or being obviously distressed by his mobility issues).
OP I would definitely speak to the vet again about pain relief options. A good vet will work with you to make sure they are kept out of pain. It should be their priority. My boy was on anti-inflammatories, paracetamol and gabapentin. The gabapentin made a big difference to his quality of life towards the end.
One morning he couldn’t get up, tried, fell back with his back legs refusing to work and really panicked then just totally defeated. The look on his face was enough, we knew he wasn’t happy living like that. He had been going downhill slightly for a couple of days, had toileted in the house a couple of times when he didn’t make it to the back door and seemed to have lost his sparkle, iykwim, but we weren’t sure until that moment.
It was a very hard decision, but a few months on, even though we miss him every single day, we know it was the right one for him and keeping him going any longer would have been for us not him.
So sorry you are going through this @Feeblebeeble she is absolutely beautiful. 