Ask a Dog Vet and Get Answers to Your Dog Health Questions
I am sorry to hear you are worried about your dog. I just came online and saw your question; I am sorry you did not get help from an expert until now. I am a veterinarian and will do my best to help.
Is he still breathing hard; do you still need help with him? Breathing hard can be a sign of pain, stress, fever, or a problem with the heart or lungs but since he is only 5 that is less likely. You should check his gums to see if they are a normal pink color or if they seem pale.