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I would go back and ask the trainer to elaborate. This is, after all, why you took him there in the first place and any trainer worth their salt is going to explain whatever issues they saw. Also I cannot see how this could really be much of an issue if the puppy passed with flying colours-- perhaps you took it to be more of a problem than it really is just as you were taking him in with a specific concern? That can influence what we hear back.
And to be honest, I'd wonder why the trainer was surprised at a puppy as young as your cocker following an adult into a crate? The pup is only 6 months old -- that sounds like exactly the kind of thing an outgoing, friendly, confident puppy would do at that age if the boxer didn't initially mind (surely this is why he passed?!) and at his age, he falls within the time period when most adult dogs still let most pups away with all sorts of things but is only just now beginning to lose what trainer Ian Dunbar calls his 'puppy license' -- only now would adults generally begin to start becoming intolerant (maybe why you are seeing the response from your adults). But that is quite normal. I come across puppies all the time just like yours in classes and at doggie day care that my friends run. Actually I will disagree a bit here with the previous response
-- it is far better IMHO to have a pup this age learn to behave from adults as humans absolutely cannot teach a pup how to read dog language and dog signs and without the socialisation now from adults, the risk is a dog that will end up like the poodle mentioned above. It is the actual mixing and contact and doggie-language discipline that teaches young pups how to be polite adults. Removing him all the time (some of the time, yes, if he is a pest, but not all the time) rather than letting the adults manage the situation and relationships mans he doesn't learn how to interact with dogs, he learns that humans will come have him do something else and never has to deal with learning what to watch out for as warning signs from dogs. I also don't think he sounds like a bully, just extra exuberant. A bully would not pass a temperament test and a trainer would surely have made clear deep reservations on this issue I think?
What did the boxer do? How did the pup respond? And when you say your cavalier has 'bit' him, do you mean snap or actually bite as in physically harm the pup, leave marks, draw blood? It is normal for adults to snap and I would leave them to it as long as they are not making skin contact -- and though as Marjorie says, I'd give your adults a break from an annoying pup as some adults do not care for puppies full stop and find them very frustrating, and simply put him in an xpen for example. I personally wouldn't say no either -- I'd just call him away cheerfully, do something else with him (Mrjorie gave some good examples -- right now's a good time to start training him, always using positive methods
)or put him in an xpen (with a pup this outgoing, please invest in an xpen -- it will be your favourite tool and you can use it in so many ways! I have adult dogs and use two panels as an impromptu baby gate for example all the time).
In short -- unless your puppy is confronting adults -- and by that I mean going for them and not just play-fighting, and is actually aggressive -- I think you just have a very active confident puppy.
If he passed a temperament test, that indicates this is exactly what you have -- just an outgoing, happy, if hyperactive puppy (nd one that will benefit from some more adult confrontation if he isn't being hurt...).
And THAT said: be prepared as it sounds like you have a smart and active dog that is going to need LOTS of physical and brain exercise. This is exactly the dog to get right into puppy classes NOW, then do a few levels of obedience and I'd do agility or other activities once he hits a year or 18 months and his joints are fully formed (so is OK for running/jumping of agility). Such dogs are wonderful but ARE a challenge and do not suit everyone -- I own one and he is my favourite dog but I call him the attention deficit dog and he is up for action all the time. Buying those dog puzzles (see sites like sitstay.com) are great for dogs like this, for example. On the downside, I do get dogs like this up for rehoming from homes that cannot cope or meet the dog's needs. They want a quiet couchpotato and they get wonder dog...
For more on puppies, check out
www.dogstardaily.com.