Final answer:
Senior dogs do not growl more as a common behavior problem in old age.
Step-by-step explanation:
The common behavior problems in senior dogs include incontinence, increased growling, cognitive dysfunction, and pain-related behavior changes. However, the answer to your question is that senior dogs do not growl more as a common behavior problem in old age. They may growl due to pain or discomfort, but it is not specifically attributed to old age.