My dog is pooping in a different area

Question
My dog is 11 years old and has just recently started pooping in a completely different area.  He has always gone around the back of our house where no one ever goes but the dogs.  Lately, he has started pooping on our patio area at the front of the house.  Can you explain why this is happening?  I scold him when he does it and tell him "No potty. Bad."  And, then I will take him to the back and say, "Go Potty.  Good."  I don't know if I should scold him or not, or if this is old age creeping up on him.  Help!

Answer
Depending on what breed the dog is, 11 years old can be fairly old.  For example, some breeds life expectancy is only 8-10 years.  Dogs do change as they age, just like humans do.  Their mind and body slows down, and they can have different habits, or be confused.  It is ok to reprimand him if you think he understands it, but it would be best to prevent it by going outside with him so you can make sure he walks all the way around back to the spot, and doesn't just stop at the patio.