Does receiving fluids under the skin hurt the animal?

Usually not, if the fluid is close to body temperature and the movements are calm. The area between the shoulder blades is not very sensitive and many animals stay relaxed, especially if you pair the session with a much loved treat. The most common discomfort comes from fluid that is too cold or a reused, blunted needle. If the animal reacts with clear pain despite warm fluid and a fresh needle, raise it with the vet before continuing.

How much fluid should I give and how often?

This is the one part you cannot decide alone. Volume, fluid type and frequency depend on the diagnosis, weight, kidney and heart function and test values, and are set by the vet treating the animal. Do not raise the dose because it seems dehydrated and do not lower it because it looks like a lot: if you think the therapy needs changing, the change always goes through a check, not through your estimate at home.

I saw a drop of blood or fluid leaking from the hole: is that serious?

Usually not. A small drop of blood at the entry point is common and stops with light pressure. A little fluid weeping from the hole after you remove the needle happens and is not dangerous. It becomes a reason to call if the bleeding does not stop, if a warm and painful swelling forms, or if the spot stays red over the following days, because that can mean irritation or an infection to assess.

The animal struggles and I cannot finish the session: what do I do?

First, do not chase the volume at all costs. Stop, note how much you managed to give and try again later or at the next session, warming the fluid well and working in a quieter place. A second person offering food, a familiar towel and a comfortable position often helps. If the difficulty keeps happening, ask the vet to review the technique with you: small tweaks to posture and needle gauge make a big difference.

Caring for senior pets35 minLevel: IntermediateUpdated on August 19, 2026

Managing at home subcutaneous fluids for a senior pet

How to give subcutaneous fluids to a senior pet calmly and safely: preparation, step by step technique, hygiene and the signs that call for the vet.

Audience: Pet owners
Species: Dog, Cat
Scope: Valid everywhere, Italy, European Union

What you need before you start

La prescrizione del veterinario con tipo di fluido, volume per seduta e frequenza
Una dimostrazione pratica in ambulatorio, con la prima somministrazione fatta insieme al personale
Il materiale fornito o indicato dalla clinica: sacca, deflussore, aghi sterili monouso
Un luogo tranquillo in casa e, se possibile, una seconda persona che tenga compagnia all'animale

For many senior animals with chronic kidney disease, or other conditions that drain fluids, the vet prescribes fluids to be given under the skin at home. It is one of the procedures that worries owners most and, at the same time, one that with a little method becomes quick and well tolerated. This guide does not tell you how much fluid to give, because volume, frequency and fluid type are set by whoever treats the animal: it covers how to organise the space, how to prepare the kit, how to carry out the administration calmly and how to recognise the few signs that mean stop and call the clinic. Read it as a companion to the hands on demonstration you received at the practice, never as a replacement for it.

Before you start: what the vet must tell you

Home subcutaneous fluids are not improvised and not copied from another animal. Before your first solo session you need precise instructions and you should have watched them applied in person at least once. If a single point is unclear, ask to see it again: getting volume or frequency wrong on a fragile heart or kidney is not a detail.

The fluid type and the exact volume per session, with the weekly frequency.
The temperature to warm the bag to, usually close to body temperature, and how to warm it without a microwave.
The needle gauge and how often to change it, always sterile and single use.
How and where to store the opened bag and for how many days it stays usable.
The signs that mean stop and call at once, and a number to use out of hours.

Preparing the space and the kit

A calm session depends above all on how tidy the preparation is. If you scramble for the needle with the animal already in position, you pass on tension and next time will be harder. Set everything up first, in a quiet spot, and warm the bag as instructed: cold fluid is the most common cause of discomfort and of animals that wriggle free.

Wash your hands and clear a clean surface near the chosen spot.
Warm the bag to close to body temperature by standing it in warm water, not in the microwave, which heats unevenly.
Hang the bag high, half a metre or more above the animal, so the fluid runs down by gravity.
Connect the line, open the clamp and run a little fluid through to clear the air, then close it.
Fit a fresh, sterile needle without touching its tip.
Have a much loved treat ready to give during and after, to build a positive association.

The administration step by step

The fluid goes into the subcutaneous tissue, the soft space just under the skin between the shoulder blades, where a small bump forms that the body reabsorbs over the following hours. The area is not very sensitive, and most animals tolerate it well if the fluid is warm and the movements are calm.

Settle the animal and keep calm
Place it on a stable surface, ideally with a person reassuring it and offering the treat. Speak softly: your tone matters more than the words.
Lift the tent of skin
Between the shoulder blades, gently pinch the skin with thumb and finger and lift it into a tent: below it is the space the fluid will enter.
Insert the needle with a firm motion
Introduce the needle at the base of the tent, parallel to the back and away from your fingers. A confident move hurts less than a slow, hesitant one.
Open the flow and let the fluid run
Open the clamp and watch the fluid descend. A soft bump forming under the skin means you are in the right place; drops or dampness on the coat mean the needle has slipped out and needs repositioning.
Give only the prescribed volume
Stop exactly at the volume the vet set. Do not add fluid because the animal behaved well, and do not cut it because it looks like a lot: the dose is the dose.
Withdraw the needle and end on a good note
Close the clamp, slide the needle out and press briefly with a clean finger on the tiny hole. Drop the needle into the rigid container and finish with fuss and a treat.

Hygiene, disposal and storage

Most avoidable complications come from hygiene or handling errors. The rules are few and not negotiable, because introducing germs under the skin of an already fragile animal can turn a supportive therapy into a serious infection.

Basic rules on needles, bag and kit. When in doubt, the clinic's instruction always wins.
Item	Rule	Why
Needle	New and sterile every session	A reused needle is blunt and carries germs under the skin
Used needles	Into the dedicated rigid container	Never the household bin, for law and safety
Opened bag	Stored and used within the stated days	Contaminated or expired fluid is a risk, not a saving
Giving line	Replaced as instructed	The tube is the direct route into the tissue
Hands and surface	Clean before every session	Contamination almost always starts here

What to record and when to call

Fluid therapy is not an isolated act, it is part of a wider monitoring of the senior animal. Noting a few things each session turns the therapy into data the vet can use and helps you catch a change in time. A notebook or digital diary with date, volume and how it went is worth more than memory.

Date, time, volume given and how well the animal tolerated the session.
Periodic weight, appetite, how much water it drinks and the look of the urine.
Swellings that do not reabsorb, redness or pain at the injection site.
Times you could not give the full volume, so the vet can take it into account.

Frequently asked questions

Does receiving fluids under the skin hurt the animal?: Usually not, if the fluid is close to body temperature and the movements are calm. The area between the shoulder blades is not very sensitive and many animals stay relaxed, especially if you pair the session with a much loved treat. The most common discomfort comes from fluid that is too cold or a reused, blunted needle. If the animal reacts with clear pain despite warm fluid and a fresh needle, raise it with the vet before continuing.
How much fluid should I give and how often?: This is the one part you cannot decide alone. Volume, fluid type and frequency depend on the diagnosis, weight, kidney and heart function and test values, and are set by the vet treating the animal. Do not raise the dose because it seems dehydrated and do not lower it because it looks like a lot: if you think the therapy needs changing, the change always goes through a check, not through your estimate at home.
I saw a drop of blood or fluid leaking from the hole: is that serious?: Usually not. A small drop of blood at the entry point is common and stops with light pressure. A little fluid weeping from the hole after you remove the needle happens and is not dangerous. It becomes a reason to call if the bleeding does not stop, if a warm and painful swelling forms, or if the spot stays red over the following days, because that can mean irritation or an infection to assess.
The animal struggles and I cannot finish the session: what do I do?: First, do not chase the volume at all costs. Stop, note how much you managed to give and try again later or at the next session, warming the fluid well and working in a quieter place. A second person offering food, a familiar towel and a comfortable position often helps. If the difficulty keeps happening, ask the vet to review the technique with you: small tweaks to posture and needle gauge make a big difference.

What to do next

Give fluids only as prescribed and after a demonstration at the practice. Set everything up in advance, warm the fluid to body temperature, use a fresh sterile needle every session, give exactly the stated volume and finish with a treat. Record volume and tolerance each session and stop at once, calling the clinic, if laboured breathing, pain or a swelling that will not reabsorb appears.