At what age (approx) does a male cocker pup approach puberty?
Haven't been able to do a thing with Blue for a few days. He was 19 weeks yesterday. He's trailing about the house, whiny, not eating, a
bit lot of humping - which is now definitely rooted in 'sexual excitement', not play, and is very difficult to put a stop to as he does not take the 'firm no!' for an answer.

'Time out' is the obvious solution, when at home that's easy, but what to do when out & about and it happens?
As far as I know, we don't have any bitches in season locally, although I've no idea how far that signal can travel, so it's always possible.
Is this puberty then? What else should I expect?