Fluid is lost from the body by breathing/panting (insensible), normal urination or polyuria, (urinary), and normal bowel movements or diarrhea (fecal). They're called sensible losses because they can be easily detected and measured. Vomiting fits into the sensible category and when it's severe, dehydration can take place.
When vomiting occurs, it is possible to have dehydration [1] and/or possible hypoglycemia. [2][3][4]. Some of what you are basing the insulin dose on is the eaten food going through the digestive process; when it's not digested or only partly digested, you have a mismatch of food and insulin [5] If you're having a particularly rough time with vomiting episodes, you may want to talk with your vet about decreasing the insulin a bit temporarily to avoid possible hypos until the situation with the vomiting is resolved. 
References[]
- ↑ Fluid Loss From Vomiting. Washington State University.
- ↑ Hypoglycemia in Dogs. BD Diabetes.
- ↑ Vomiting/Diarrhea. Children With Diabetes.
- ↑ Insulin Requirements Decrease with Vomiting/Diarrhea. Children With Diabetes.
- ↑ Other Medical Problems. Drugs.com.
More Information[]
- Effect of Renal Failure on Gastrointestinal Physiology in Dogs H.P. Lefebvre, J.P. Ferré, A.D.J Watson, 2002, WSAVA
- Gastrointestinal Signs in Endocrine Diseases-Dogs & Cats Provet UK
- Drugs Used to Control (Antiemetic) or Stimulate (Emetic) Vomiting Merck Veterinary Manual
- Sodium & Chloride Deficiency in Vomiting Drs. Foster & Smith
- Potassium Deficiency & Vomiting Drs. Foster & Smith
- Digestive Disturbances in Dogs PetsHealth
- Management of Persistent Vomiting Simpson, Kenneth W., October 2000, District of Columbia Academy of Veterinary Medicine
- Fluid therapy in vomiting and diarrhea Brown AJ, Otto CM., 2008, Veterinary Clinics of North America-Small Animal Practice
- Vomiting: When is it Time for Alarm? New Hope Animal Hospital
- Vomiting Washington State University
- Difficult Vomiting Disorders: Therapy Washabau, Robert J. 2009, WSAVA
- Investigating the Cause of Chronic Vomiting VetCentric
- Difficult Vomiting Disorders-pages 107-110 Washabau, Robert J. March 2002, 110th Penn Annual Conference
This is a large file-over 300 pages so it may take some time to download. - Adverse Reactions to Food: Chronic Adverse Immunological Responses to Dietary Antigens Cave, Nick, 2010, WSAVA
- Dietary Approach to Gastrointestinal Disorders--Acute Gastroenteritis Cave, Nick, 2010, WSAVA
- The Vomiting Dog - Diagnosis Tams, Todd R., 2001, Atlantic Coast Veterinary Conference
- Pharmacologic Control of Vomiting Tams, Todd R. Tams, 2001, Atlantic Coast Veterinary Conference