Yup. My dog is not foody, so it's not been something I did a lot with him. However, I had some rescues who were absolutely amazing with the clicker.The clicker is used in the acquisition of behavior. So if the dog already "knows" the cue, you wouldn't use a clicker to get the behavior. I'm not saying you can't or shouldn't, it just wouldn't be necessary. However, if you're seeking to expand your dog's behavior, yes, any age is a good age for a clicker, and using the clicker to condition it with known behaviors is a great place to start.