Cats become more prone with age to kidney disease or chronic renal failure (CRF). Their failing kidneys pass increasing amounts of urine, so they need subcutaneous (under the skin) fluid injections to help them stay hydrated and flush waste buildup.
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Fluid
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Lactated Ringer's Solution (LRS), which contains electrolytes, or a simple saline solution may be used.
Methods
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Fluid may be administered with a needle and syringe, but veterinarians often prescribe a reusable 1,000 ml vinyl drip bag and needle setup because more fluid is needed.
Needles
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Cats best tolerate 20- or 18-gauge needles. The 20-gauge needle is finer and may be less painful, but it takes longer for the fluid to pass into the cat.
Procedure
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No special skill is required because you inject fluid under skin on the cat's back, not in a vein or muscle. The only discomfort is the brief needle prick. Praise the cat and give treats after subcutaneous fluid injections so it will associate them with pleasant things.
Absorption
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Fluid collects in the cat's abdomen or front legs and can take up to 24 hours to be fully absorbed. You can feel the fluid lump.
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