Help, My Dog is Vomiting
Vomiting in dogs is a very tasteless occurrence and can arise from a wide range of causes, from straightforward gastritis to involved diseases of other body systems. Not only is it very distressing for both the dog and owner, it also provides a challenge for the veterinarian. This narrative explains the many causes of vomiting in dogs, along with adverse food reactions, and the range of rehabilitation options available.
What is vomiting?
Vomiting is the expulsion of food, fluid or debris from the stomach or small intestine due to coordinated movements of the gastrointestinal, musculoskeletal and nervous systems. It is important to differentiate this from regurgitation, which is a passive process rather than a coordinated effort like vomiting.
Regurgitation is a sign of disease in the esophagus, such as obstructions (foreign bodies such as a stick, bone or toy, or a stricture), esophagitis (inflammation of the esophagus) or megaesophagus (dilatation of the esophagus due to weakening of the level muscle). The main dissimilarity between regurgitation and vomiting is that regurgitation is effortless, while vomiting is accompanied by strong abdominal contractions.
How can I tell vomiting and regurgitation apart?
Sometimes this is not easy to do. Generally speaking, if it happens immediately after eating it is more likely to be regurgitation (though vomiting can still occur then). If the content of the material expelled appears to be thoroughly undigested food, this also supports regurgitation. If the nearnessy of bile can be confirmed though, it is more likely to be vomiting.
Causes of vomiting
The most tasteless causes of vomiting are dietary related, either through dietary indiscretion (e.g. Overeating, eating overly rich or spoiled food) which causes acute (sudden) vomiting, or adverse food reactions (food allergies) which can cause lasting (long term and intermittent) vomiting.
However, there are a huge whole of other causes arising from either the gastrointestinal principles itself (stomach and small intestine) or secondary to disease elsewhere in the body (e.g. Liver or kidney disease). Within the stomach, inherent causes include:
1. Gastritis (inflammatory disease)
2. Stomach ulceration
3. Stomach cancer
4. Obstruction (foreign bodies, telescoping of intestine)
5. Hiatal hernia (part stomach herniating through the diaphragm)
Possible causes within the intestine include:
1. Infectious diseases (e.g. Parvovirus)
3. Inflammatory bowel disease
4. Intestinal cancer
Secondary causes of vomiting that are due to disease elsewhere in the body include:
1. Pancreatitis (infection or inflammation of the pancreas)
2. Peritonitis (infection in the abdominal cavity)
3. Hepatitis (liver inflammation)
4. Kidney failure
5. Pyometra (infection of the uterus)
6. Hormonal deficiencies or excesses (e.g. Addisons disease, Diabetes Mellitus, Septicemia, Calcium imbalance)
Other inherent causes that do not fit into the above categories are drug reactions (e.g. Digoxin, chemotherapy drugs, Nsaids) and neurological disorders.
Treatment of vomiting
Vomiting is a symptom, not a disease in itself. either or not rehabilitation is thorough depends upon the personel circumstances. If the dog is only vomiting occasionally, is attractive and otherwise general on examination, rehabilitation is probably not necessary. Some dogs with sensitive digestive systems will vomit once or twice a month regardless of any treatment, and if they are otherwise well this should be ignored.
For acute vomiting cases, the first step should always be to starve the dog for 24 hours (while retention plenty of water available ad lib). After the period of starvation, the dog should be offered small portions of a very bland food, such as chicken and boiled rice, for a few days. Meals should be fed as smaller portions any times a day, rather than one larger meal.
Though treating the symptom itself will often heighten patient demeanor and comfort, it is no transfer for development a strict pathology of the fundamental cause, and safe bet drugs can be harmful if given blindly (for example, giving metoclopromide to a dog with a gastric or intestinal obstruction). Admittedly cases of acute and severe vomiting need immediate treatment, as dogs can come to be rapidly dehydrated, design electrolyte imbalances and aspiration pneumonia otherwise.
Managing the vomiting dog
There are 2 goals when dealing with a vomiting dog:
1. Recognize the fundamental cause
2. Stop the vomiting in a safe and productive manner
In many cases, anti emetic therapy (the technical term for vomiting is emesis, and therefore drugs used to treat it are called anti emetics) is instigated immediately while the cause is being established.
A veterinarian will start by taking a full history, focusing especially on general diet, modern medication, vaccination status and the narrative of the symptoms. He or she must first make sure that the dog is Admittedly vomiting and not regurgitating, which has a thoroughly different set of fundamental causes. It is also important to get a visible narrative of the material expelled, and either it contained bile, fresh blood or what appears to be coffee granules (partly digested blood).
The next step is a full clinical examination, along with considered feeling the abdomen, taking the dogs rectal temperature and assessing the hydration status. Once this is completed, a veterinarian will have a slightly narrowed down list of differential diagnoses in mind. If the dog is not dehydrated, attractive in demeanor, and both vital parameters and feeling the abdomen were normal, the veterinarian will often (and rightly so) make a presumptive pathology of gastritis, or gastroenteritis if diarrhea is gift too, and designate antibiotics to combat the likely bacterial infection. The owner is then likely to be sent home with instructions to starve the dog for 24hrs and give bland food for a few days, alongside the antibiotics. The owner is instructed to monitor the dog closely, and return immediately if there are any signs of deterioration, or 2 to 3 days later for a routine check up.
If there are any findings in the clinical history or the corporeal exam that trigger concern, then further tests are necessary. The first of these is ordinarily blood tests for hematology and biochemistry profiles. Urine and feces may also be analysed, the latter for either nasty bacteria or parasites. further laboratory tests may be required in safe bet circumstances, such as bile acid stimulation testing if liver dysfunction is suspected, or an Acth stimulation test to look for adrenal disease.
The next stage of the work up involves imaging. The most beneficial is abdominal radiography (xrays), but ultrasonography and endoscopy can also be very important. Radiography and endoscopy both have to be carried out under general anesthesia, while ultrasonography can be performed conscious. If the imaging does not review the fundamental cause then biopsies may be taken, either endoscopically guided or via exploratory surgery. Histopathology of these samples (studying the tissue microscopically) can give vital clues as to the cause, particularly by differentiating between inflammation and cancer.
The final diagnostic option is the therapeutic trial. If the dog gets good on the medication prescribed, then it must have been a safe bet type of disease that responds to that drug. By this rationale, wormers, antibiotics or an exclusion diet trial may be chosen.
Drugs used in the rehabilitation of vomiting
1. Stomach protectants and antacids
These medications are beneficial when stomach ulceration is suspected. Examples include sucralfate (acts like a band aid over the ulcer), H2 antagonists (reduce acid production) and omeprazole (also reduces acidity).
This drug blocks a neurotransmitter in the brain called dopamine, which prevents activation of the vomiting centre in the brain (known as the Chemoreceptor Trigger Zone). It is only partially productive in doing this though, and has the further result of expanding transmit motility of the gut. This means it must never be given to dogs that might have a stomach or intestinal obstruction. It can also cause reasoning changes such as hyperactivity and disorientation.
3. Phenothiazines (e.g. Acepromazine, Acp)
These are productive at blocking the dopamine receptors mentioned above, in expanding to other receptors involved in the vomiting reflex. They are ordinarily used when metoclopromide has failed, but also have undesirable side effects such as low blood pressure and sedation.
Histamine receptors are also gift in the Chemoreceptor Trigger Zone, the part of the brain that controls the vomiting reflex. Antihistamines are productive in blocking vomiting that is due to motion sickness, but are exiguous use against other causes.
Domperidone has a similar action to metoclopromide in that it blocks dopamine receptors and secondarily blocks serotonin receptors, but it does not have the promotility effects of metoclopromide. However, side effects include vulval enlargement and inherent effects on fertility.
This is a new drug that is a Neurokinin 1 (Nk1) receptor antagonist. It can be given orally or by injection, and is extremely productive at stopping vomiting by working both on the vomiting centre in the brain and on the stomach itself. It is deemed so productive at stopping vomiting that veterinarians must be just to properly investigate potentially hazardous fundamental causes, that could be masked fatally by this drug.
Help, My Dog is Vomiting
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