I agree, but sometimes people really need to hear the truth when it comes to dogs as well. I hope the OP didn’t phrase it that way

You tried to logic your way out of an emotional problem, that rarely works.

My worry was that it was worded that way, not in a nicer way out of concern for the pets health. Look, I haven't owned pets since I was a teen but my MIL lives on a farm and my aunts own cats and dogs galore. Aunts are extremely emotional and I wouldn't dare say what you said. My MIL though, would understand completely and can let go if needed. And I agree with the other, you can't use reasoning with someone who's emotional. They wont listen, unfortunately.

My pets are pet of my family, like my child. I still wouldn’t spend 7k on a 14 yr old dog, I would let her go peacefully.

my 3 pets are most certainly "family". when you get pets, you are responsible for their health and well-being just like you would be for a child. her answer was cold and callous, as was yours.

No, it is not. It is a normal and reasonable answer. Putting an old pet in for a heavy surgery like that not only has only a very small chance of success at all, you're also running the risk of injuring (or worse) the pet even more. This is no different for humans too. There are plenty of operations they won't do on elderly people, not because they like to see old people suffer, but because it's pointless and they stand a big chance of not surviving it.

That's where you are wrong bud. My dogs and cats are my kids. They are my family. Now I would say that the friend asking another friend for 7 thousand to keep their family member alive when it would cause them so most likely suffer more, yes that's cruel. Just like I think it is cruel to do that to humans.