My pup who is around 4 months old is very aggressive and hostile to his mother and other dogs in general. He often barks at dogs 3-4 times his size (the mom's no exception).
Such aggressiveness in him often forces us to chain him for extended periods of time should he escape and hurt himself in doggie turf wars. I myself am no fond of chaining the dog but it seems a necessary evil. What are some good and humane alternatives to chaining my dog for extended periods of time