I just went and purchased some new waders so I could start the process of getting my 17 week old lab to start learning to swim! Only problem is that I live in the eastern Washington and it is still cold here. We are still below freezing at night. He has went into the water up to his belly a couple times chasing my other dog who has no problem swimming anytime. She will bust the ice if she has to. He was fine after but he was only in a couple seconds before I made him get out in fear it was to cold. So my question is "I want to start training in the water with my puppy but what temperature is too cold for him to swim since he is still young?"