My dog is currently experiencing the same symptoms and I too believe that it could be congestive heart failure. How did your dog turn out?
Can You Help? Dog Tongue Is Ice Cold,panting,bloated Tummy, Is At Vet Right Now...chf?
Could be bloat, if vet isn't seen could be deadly
My Dog has the same thing, His touge is cold and its purple too. We are thinking of putting him dowm he is old and we thnk this is it but not for yours probably