Researchers have found that most dogs can understand roughly 80 to 165 words depending on their training, breed tendencies, and individual differences in motivation. The majority of dog owners tend to overestimate the number of words their own dogs understand, that is, we give them more credit for understanding us than is due. We all would like to believe that are dogs are exceptional and there are some truly exceptional dogs out there that know more than 200 words, and even famously studied dogs like Chaser, the border collie, who knew the individual names of more than one thousand objects.
So, are there certain words or phrases that we use that are more likely to be understood by our dogs? Absolutely. The word your dog knows best is their name, and that list of nicknames you have for them. They also know those words that apply to basic requests like sit, down, come, stay, and wait. Knowing the words does not equal compliance, however, meaning that just because your dog knows the word "come" doesn't mean he's automatically going to do it, particularly if there's something else grabbing his attention. Dogs with actual jobs seem to have the ability to recognize more words and that makes sense. If your dog's sole purpose in life is to keep the end of the sofa warm and watch for squirrels, that doesn't require as much brain power and word recognition as the dogs sniffing for contraband, guiding the blind, or herding sheep. The average working dog knows at least 120 words, while many actually recognize close to 200 or more. The average couch potato? Fifteen to 80 words known.
Beyond knowing their name and the words for basic behaviors, your dog also recognizes and enjoys the words and phrases you use that imply that they are doing a good job. When you tell your dog how good they are, how cute they are, or how much you love them, those words of affirmation and praise register as rewards in their brain similar to when they are offered food or treats. As you might imagine, pairing food or treats with those words of praise really lights up their brains!
If you want to increase your dog's word recognition, take your time. Pair the new word or command with the object or desired behavior, using high value treats for reinforcement. Your tone of voice matters, so use an upbeat tone and plenty of praise. Repetition helps, but even more so doing short sessions over the course of several days helps to solidify that new word, command, or phrase for your dog, just as it works for you if you are learning a foreign language for the first time.
I myself have regular conversations with my dogs. While I know they are basically just politely listening to my ramblings, I also know that they are picking out the words and phrases that have meaning to them and they do respond when they hit upon those words or phrases. Does that mean that I'm wasting my time with the other 5000 words I babble at them all day long? Absolutely not. They don't need to understand every word for me to feel heard. I've had entire conversations with Henley because he's the most attentive listener. I'll get to the end of my thoughts and, just for fun, ask him what he thinks. I do this because asking him what he thinks often results in a head tilt and then him going to get a toy, almost as if he's saying, "I don't have any idea what you just said but I'm pretty sure playing with this toy will make you feel right as rain." And you know what? He's right. A little play time often does make it all better.
As always, if you have questions about your pet's behavior, you know where to find me.
Henley sits like this when I talk to him and I love this about him. He is an intent listener who really does seem to focus on every word. It's quite obvious, however, when I hit upon a word or phrase he knows well though as he'll often tap his front feet or give an open mouth grin, as if to say, "Hey! I know just what you mean!"

