If your veterinarian has recommended subcutaneous (sub-Q) fluids for your dog or cat, there is a good chance they asked for Lactated Ringer's. This guide explains what Lactated Ringer's is, why vets use it for pets, what supplies you need, and where to buy it without paying clinic prices for every bag.
What is Lactated Ringer's?
Lactated Ringer's solution (LR, also called Ringer's lactate or LRS) is a sterile IV fluid made of water with sodium, chloride, potassium, calcium and lactate. Its electrolyte balance is closer to the body's own fluids than plain saline, which is why it is often called a "balanced" fluid. Veterinary-labeled LR (such as Vetivex) and human-labeled LR are the same solution; the difference is the label and the price.
Why vets prescribe Lactated Ringer's for dogs and cats
Lactated Ringer's is the fluid veterinarians most often send home for sub-Q use. Common reasons include:
- Chronic kidney disease, especially in older cats, where regular fluids help support hydration
- Dehydration from vomiting, diarrhea or reduced drinking
- Recovery after illness or surgery
- Other ongoing conditions where your vet wants extra fluid support at home
Your veterinarian decides whether fluids are right for your pet, which fluid to use, how much to give and how often. Those details depend on your pet's size, condition and bloodwork, so do not change them without talking to your vet.
Lactated Ringer's vs. normal saline for pets
Both are sterile, isotonic fluids, and vets use both. LR is usually the default for sub-Q fluids because its electrolytes are more balanced. Normal saline (0.9% sodium chloride) is sometimes preferred for specific conditions. If your vet names a fluid, buy that one. For a deeper comparison, see normal saline vs. Lactated Ringer's.
Supplies you need for sub-Q fluids at home
Everything in one order: our Complete SubQ Fluid Kit with Lactated Ringer's includes a 1000 mL Baxter LR bag, IV tubing, 10 Monoject Magellan safety needles in 18, 20 or 22 gauge, and 10 alcohol prep pads. That's one fresh needle for every session in the bag. The kit is also available with normal saline.
For every bag after that: pair a 1000 mL Lactated Ringer's bag with a SubQ Refill Pack, which includes new tubing, 10 safety needles and 10 alcohol prep pads.
Buying the pieces separately? Here's what you need:
- A bag of Lactated Ringer's, usually 1000 mL. We sell genuine Baxter Lactated Ringer's, 1000 mL.
- An administration set (IV line) that spikes the bag and controls the flow, such as our IV administration set.
- Needles in the gauge your veterinarian recommends. Use a new sterile needle for every session. 18 gauge flows fastest and suits dogs and larger cats, 20 gauge is the most common choice, and 22 gauge is gentler for small or sensitive pets.
- Alcohol prep pads to wipe the bag's port before spiking.
- A hook or hanger to hold the bag above your pet so gravity can do the work.
For a step-by-step walkthrough of setting up the bag, priming the line and giving fluids to a cat, read our guide to subcutaneous fluids for cats at home. The same setup applies to dogs.
Lactated Ringer's for dogs
Dogs generally tolerate sub-Q fluids well, and larger dogs may use a good portion of a 1000 mL bag per session, so cost per bag matters. Fluids are usually given under the loose skin over the shoulders. An 18 gauge needle keeps sessions shorter for bigger dogs. Ask your vet to show you the technique in the clinic before you try it at home.
Lactated Ringer's for cats
Cats with kidney disease are the most common sub-Q fluid patients, and many owners give fluids for months or years. A calm routine helps: same time, same spot, a warm room and a treat afterward. Many cats settle quickly once fluids become a habit, and a 20 or 22 gauge needle is usually more comfortable than the 18 gauge many clinics send home.
Tips for giving fluids safely
- Bring the bag to around room or body temperature before use. Never microwave an IV bag.
- Check the bag before every use. Do not use it if the fluid is cloudy, discolored or leaking.
- Use a fresh needle each time and keep the end of the line capped between uses.
- A soft lump under the skin after fluids is normal and is usually absorbed within several hours.
- Call your veterinarian if the swelling does not go down, your pet has trouble breathing, seems weak or lethargic, or the injection site looks red or painful.
Where to buy Lactated Ringer's without a vet prescription
You can buy Lactated Ringer's from IV Fluid Supply with no prescription required, as a single bag, in a complete SubQ Fluid Kit with tubing, needles and prep pads, or paired with a SubQ Refill Pack when you restock. We ship genuine Baxter LR, sealed and dated 2027 or later, with free shipping on every order and no case minimum. Many pet owners find it costs far less than buying bags one at a time from a clinic. Shop Lactated Ringer's solutions or subQ fluid kits and refills.
Not having a prescription to buy does not replace your veterinarian's guidance. Keep your vet involved and follow their plan for how much fluid to give and how often.
Frequently asked questions
Can I buy Lactated Ringer's without a vet prescription?
Yes. You do not need a prescription to order Lactated Ringer's from us. Your veterinarian should still decide whether your pet needs fluids and how much to give.
Do you sell a sub-Q kit with Lactated Ringer's?
Yes. Our SubQ Fluid Kit comes with a 1000 mL Baxter Lactated Ringer's bag, IV tubing, 10 safety needles in your choice of gauge, and 10 alcohol prep pads.
What do I need when I restock?
A new 1000 mL bag of Lactated Ringer's and a SubQ Refill Pack. Most vets recommend a fresh line with each new bag, and the refill pack covers that plus one needle and prep pad per session.
Is human Lactated Ringer's the same as veterinary Lactated Ringer's?
Yes. Lactated Ringer's injection is the same solution whether the bag is labeled for human or veterinary use.
How long does an opened bag last?
Once a bag is spiked, it is no longer sealed. Ask your vet how long they want you to use an opened bag, and discard it sooner if the fluid looks cloudy or the line becomes contaminated.
How should I store unopened bags?
At room temperature, away from heat and direct sunlight, in the outer overwrap until you are ready to use them.
This guide is for general information and does not replace advice from your veterinarian.