We absolutely love Duke but unfortunately he and one of my other dogs have been fighting and getting very aggressive towards each other. To a point where I am afraid someone will get hurt accidentally. It is really my older dog who instigates the fighting but he has been with us much longer as we rescued him as a 2 week old, 4 years ago. Duke is awesome with my older lab and with our cat. He is eager to please and has a lot of playful energy. When we rescued him our vet at the time guessed he was around 1 making him around 2 1/2 now. I had genetic testing done and he tested as mainly a mix of American Staffordshire and Heeler.