You might get lucky with this guy, but he's not 'fully grown', he's an adolescent, and that's why, in my experience, he will only get tougher.
This may be irrelevant, but my chickens, for over 25 years, have lived in close proximity to my horses, and often steers. Never have any of my roosters, even the awful ones with humans, ever 'acted out' with the horses or cattle. They are different species, on separate tracts, and they know it. The human aggressive cockerels and cock birds, on the other hand, sought out and attacked humans, who brought them food. This is not 'protecting the flock', this is stupid!
Usually the cockerel would start after one person, and then widen his range and attack others, more often, and with forethought. Stalking, ambushing, miserable behaviors.
Sorry for the rant...
Mary
This may be irrelevant, but my chickens, for over 25 years, have lived in close proximity to my horses, and often steers. Never have any of my roosters, even the awful ones with humans, ever 'acted out' with the horses or cattle. They are different species, on separate tracts, and they know it. The human aggressive cockerels and cock birds, on the other hand, sought out and attacked humans, who brought them food. This is not 'protecting the flock', this is stupid!
Usually the cockerel would start after one person, and then widen his range and attack others, more often, and with forethought. Stalking, ambushing, miserable behaviors.
Sorry for the rant...
Mary
We all start somewhere and learn our own ways with chickens. Read, and take advice, than figure out what works best for your situation. If he's fine otherwise than maybe penning him up while your daughter is around is the best option instead of trying to confront him and possibly make things worse. 