
Hi Guest,
The characters of each breed which your dog is crossed from are exceptionally different and your boy will have inherited different traits from each side of his parentage plus all manner of unknown quantities just from the individual dogs themselves so it is not as straightforward for others who have not seen him and observed his antics to offer a remedy for them ;)
The obvious solution is to never let him off lead around water unless you have LOTS of spare time on your hands and towels to dry him off with :D Perhaps you could join and provide more info about his behaviour in general, your own experiences with training, etc. etc. etc and then through a some interactive exchanges there will be more assistance available.
Best wishes, Teri :P