Thank you for your email. You are certainly well versed on the condition of mega oesophagus and a very dedicated owner. It sounds like your little Bulldog puppy needs to see an Internal Medicine Specialist. They will examine her and possibly perform tests to help confirm the diagnosis. Once confirmed they will be able to tell you exactly how many calories she should be receiving as she grows and the best food to provide these calories based on her needs and body condition score. The good news is that there are several internal medicine specialists in Perth. Your veterinarian will be able to refer you to closest specialist facility in your area.