In my opinion a dog's brain specializes in receiving words and interpreting them as commands toward their motor skills or behavior, both of which are their main instinct because their brainstem (motor skills, behavior and instinct) is the dominant part of their brain. So in my POV a dog would have to have neurological issues in order to not be able to learn new tricks.
9 months ago
Last edited at 10:11AM on 3/19/2013
Not at all. My dog was 10 when we moved to tornado alley. He quickly learned his new command "Let's hide!" It took just a few times of running down to the basement with a piece of cheese in my hand. We had a practice run the other day, and no cheese was involved. He did great!