animal-factbook:

Happy national dog day!
Did you know that dogs from different countries speak different dog languages? German scientist Sigmund Freud came up with this theory after seeing his Japanese Shiba Inu and German Shepard attempting to bark at each other with no apparent understanding of each other’s barks. This theory was later proven in 2003 by the American behavior psychologist John Watson using modern technology to analyze the dog’s linguistic skills, coming to find that dogs from different geographic locations do not share the same bark sounds.