Who has doubts that a dog is the most faithful friend what can a human have, you should see this video.
A man had a seizure and an ambulance came to his home to take him to the hospital. During the journey, the ambulance nurse he realized that a dog was following them at full speed. Amazing!
When they decided to stop, they discovered that the animal was the pet of the man they were moving and they let him go up to avoid an accident.
Finally, at the hospital, the dog he waited patiently next to his human's stretcher, being the best companion that every sick person can wish for.