Author Ben Witcomb RVN
ABSTRACT Fluid therapy plays a vital role in supporting dogs and cats during surgical procedures, medical treatment and emergency care. An understanding of fluid physiology helps veterinary professionals select the most appropriate type of fluid for each patient. Water makes up a significant proportion of bodyweight and is constantly moving between intracellular and extracellular spaces. Illness, injury and fluid loss can disrupt this balance, leading to dehydration, electrolyte changes and reduced circulating volume. This article explores some of the commonly used fluid therapy options, including isotonic, hypotonic and hypertonic crystalloid solutions, as well as synthetic and natural colloids for cases requiring rapid intravascular volume support. Accurate calculation of maintenance requirements, fluid deficits and shock rates is essential to ensure safe and effective therapy, which is also considered in this
article, along with methods of administration. Fluids may be administered intravenously, subcutaneously or intraosseously, depending on the patient’s condition and how quickly support is needed. Regular assessment of hydration status using physical examination and diagnostic tests guides adjustment of treatment plans. Effective fluid therapy relies on close collaboration between veterinary nurses and veterinary surgeons to provide tailored, responsive care for every patient.
Keywords fluid therapy, intravenous, subcutaneous, intraosseous, crystalloid solutions, colloids, calculations, dehydration, assessment
DOI: https://doi.org/10.56496/QEZY4320
To cite this article: Witcomb, B. (2026) The importance of fluid therapy in dogs and cats. VNJ 41(1) pp52-58
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