This first class hotel with swimming pool and the dog dog, there is something like in Bavaria?

Would a few days in April just go to a hotel. Is it ever with his dog in such a hotel and it was good, what should it be excessive? I was 9 years not on vacation and thought could be a few days this year for vacation, but a dog that is supposed to and he likes to swim, is not so bad, but when I seek the opportunity where my dog can go swimming? @ Nerone, who is allowed? For Lake Constance, I could go too. Are there specific areas where dogs can swim? @ SonjaAna, clean, no pension, or dirty, it should already be a great hotel, first for me, so a few days ago Nice.