Using a portable oxygen therapy, or any oxygen therapy for your dog should be treated just like any kind of oxygen therapy that a human patient would use. A veterinarian would determine whether or not your dog would need oxygen therapy. If need be, he or she would prescribe the amount of oxygen your dog needs.
You should never change your pet’s oxygen dosage without your vet telling you to, and you have to make sure that the oxygen is properly administered to your dog.