I have two 5 month old male puppies, litter matesthat I have bottle fed since they were one week old. At home they are perfect. No agression to anything. However, whenever I take them out, whether on leash or at the bark park they become agressive. They will bark and agressivily chase other dogs away. They don't bite, just growl very aggressively and chase the other dogs away. As for other people, they will not go up to them. If the person approaches they will back up and try to hide. Sometimes barking all the while. I believe they feel they are protecting me.
What can I do?