Frequent Vomiting and your Dog and what you can do 
  to prevent it.
  By Tippy
  
  
  Dogs vomit easily, which is a natural safety factor in
  animals that are natural scavengers and may eat spoiled
  food.
  
  Your dog might be vomiting for a number of reasons. One of
  the major causes of frequent vomiting in pet dogs is that
  they have swallowed something (usually nonfood such as hair
  from scratching or pieces of something they have chewed up)
  that doesn't agree with their stomach. But some dogs with
  persistent vomiting are genuinely ill and need to see a
  veterinarian. And some dogs have a genetic defect that
  causes the condition.
  
  Here are the major reasons why your dog may be vomiting:
  
  - Something is stuck in the dog's throat and is triggering
  its gag reflex.
  
  - A Vascular Ring anomaly or VRA, which is a blood vessel
  that constricts the esophagus.
  
  - Esophageal Stenosis - This causes a narrowing of the
  esophagus and prevents food from going into the stomach
  quickly.
  
  - A Hiatus Hernia - This is caused by an opening or tear in
  the diaphragm, which separates the chest cavity from the
  abdomen. This makes it possible for part of the stomach to
  move up into the chest cavity and interfere with the
  esophagus and stomach.
  
  - Megaesophagus - usually this is due to poor muscle tone in
  the walls of the esophagus and causes the esophagus to
  enlarge. The coordinated movements that move food through
  the body no longer work properly, which makes food take
  longer to get to the stomach and sometimes it can come back
  up.
  
  - A birth defect - most often this affects the muscles and
  nerves of the adult dog. One such genetic disease that
  occurs in some breeds is called myasthenia gravis.
  
  If your dog has a birth defect then there is no way that
  this can be cured. But there are some things that you can do
  for your dog if it has this problem, such as raising the dog
  food and water bowl up off of the ground so that the dog's
  neck is straighter when eating or drinking. That plus
  gravity make it is easier for the dog to swallow its food.
  
  You can also feed your dog more frequent and smaller
  portions throughout the day. Some dogs have a problem with
  eating a lot at one time and an over-full stomach can cause
  vomiting. When you give the dog a meal, make sure that is a
  low calorie dog food recommended by your veterinarian. This
  will ensure that your dog will be getting the food and
  vitamins and nutrients that it needs to grow.
  
  Megaesophagus is a very dangerous disorder and can cause
  pneumonia in your dog if the food doesn't get down to its
  stomach quickly enough. Because of this there is a greater
  possibility that it can inhale some food, causing the
  pneumonia. Be careful to raise the food and water bowl off
  of the floor and to not let your dog lay down for ten
  minutes after eating to help prevent this from happening.
  
  
  
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