I have heard about the problem, but have not experienced it with any dog.
We don't have the money and it is hard. I thought the same thing about older dogs...until Jake became a part of the family. Last November we inherited him from a friend who passed. Jake turned 15 on November 12.
We have spent a lot of $ on him as well; due to regular VET costs and much needed dental work. We have made small monthly payments in order for him to get the care he needs. He is thriving, happy and acts like a pup.
You are doing a great service for your Pretty Pom. 😊 I look at Jake and wonder where he might be if my husband hadn't made the promise to take him in.
He has already made me happier than the money I have spent.
I respect what you have done to keep this dog alive and well. I also respect your realization that it is costly to keep an older pet.
It is also costly when the dog is young, as well.