Old Age Symptoms

Question
What are the symptoms of impending death from old age in a Lhasa Apso? In other words, what behavioral changes can be expected when a Lhasa is in their final days?

This may sound like a ghoulish question, but I have a compelling reason - namely, an older Lhasa in the family that *may* be dying.

Also, if you can't answer this, would you please direct me to a resource that can answer this question? I haven't been able to find anything.

Thank you for your time.

Answer
If you could describe to me what "symptoms" you are seeing, I may be able to help you better.
Every animal is different and disease, age, size and other factors will determine what might look like a dog being on its last legs.

So please let me know what you are seeing going on.