The ASPCA explains that the causes of vomiting in dogs range from the benign and everyday to the dangerous and urgent. Dogs may vomit simply from eating something disagreeable or too quickly. This is a physiological tool of the scavenger. On the other hand, vomiting may result from ingesting a toxic substance or illness. Repeat vomiting, either consistent or sporadic, should be reported to a veterinarian at the earliest opportunity.
The causes for vomiting in dogs are extremely diverse. Changes in diet or the individual dog's tolerance of certain foods may induce vomiting. Like people, dogs can vomit because of post-operative nausea or car sickness, according to WebMD. Dogs may also vomit due to viral infections, parasite infestation, pancreatitis, and kidney or gall bladder distress, and female dogs may vomit due to a uterine infection. Because many dogs regularly ingest a number of foreign objects, they may vomit after swallowing bits of bone, chew toys or other items that disturb the gastrointestinal tract.
Like in humans, certain medications may cause nausea and vomiting. Additionally, vomiting may result from heatstroke in dogs. If a dog suffers from long-term or chronic vomiting that appears sporadically, the animal may be suffering from such conditions as constipation, liver disease, kidney disease, intestinal inflammation or even cancer. In short, irregular but long-term vomiting warns of systemic illness. Because the causes of vomiting in dogs are so varied, it means that the cause itself may be hard for the physician to locate or determine. Therefore, prompt action is required. The ASPCA suggests bringing a pet in as soon as possible to a veterinarian to run diagnostic tests and undergo a comprehensive physical.