Havanese Puppy With Tongue That Sticks Out All The Time. Is This Normal?

If your dog is not showing other signs of illnesses like loss of appetite, shaking, lethargy, drooling etc then its normal, otherwise take him to vet for diagnosis and treatment. Your dog's problem of tongue can be due to

   1. Exercise
   2. Exposure heat conditions
   3. Hot and humid environment
   4. Fever
   5. Fear and excitement
   6. Heartworm
   7. Hypothyroidism
   8. Poisoning
   9. Anemia