Signs of dying of old age in dog?

Same as in a human that dies of 'natural causes' in old age.

1. Slowing down. This actually begins after the peak of adulthood and is usually not an immanent sign.

2. Sleeping more - spending more and more of the day in a state of light sleep.

3. Not wanting to eat much, then not wanting to eat at all. (Taste and smell are the first senses to go, hearing is usually the last.)

4. Not wanting to drink after a while, either.

5. Staying in one spot drowsing, not active.

6. As death approaches, extremities get chilly.

7 Possible incontinence. May have restless spells, confusion, 'seeing things.'

8. Near the end, obvious changes in breathing with eventual cessation.

Life expentancies differ for dog breeds. For some of the larger breeds, 12 - 14 is doing great. The process of dying can take hours to days.

Always ask your vet about your pet's health and any changes you see.