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Fluid Therapy in Cats
Written By hannah hollinger
Published: 01/06/2017Updated: 01/13/2022
Veterinary reviewed by Dr. Linda Simon, MVB MRCVS
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What is Fluid Therapy?
Fluid therapy involves the intravenous or subcutaneous administration of fluid to an animal. This is typically done to replace fluid that has been lost either due to injury or disease. Vets use fluid therapy often, as it is a key part of treating some of the most common medical problems that owners will bring their pets to a clinic for.
Fluid Therapy Procedure in Cats
Fluids are commonly administered to cat intravenously (through a vein), or subcutaneously (under the skin).
Intravenous 
To begin intravenous (IV) fluid therapy, the vet will shave the area around the vein being targeted for injection. This will both allow the vet to easily locate the vein and make it more straightforward to attach the IV drip to the cat. The next step is to clean the skin and insert a catheter using a hypodermic needle and tape it in place before attaching the drip. The drip is then connected to a bag of fluid (normally a saline solution), which is elevated above the cat so that it can drain via gravity at a steady pace into the cat's body. Fluid pumps are often needed so we can control the rate of fluid adminstration. When the bag is sufficiently depleted, the fluids are replaced or, if the cat is well again, the catheter is removed.
Subcutaneous
A subcutaneous fluid administration procedure is similar to IV administration, but rather than inserting a catheter into a vein, a needle is used to deliver fluid under the cat’s skin near the spine. The procedure is performed in-office by vets, but is also commonly recommended for at-home administration for cats with chronic health issues, such as kidney disease. It is far less effective than IV fluids and cannot deliver the same amount of fluids. It is not appropriate for those who have acute kidney failure or severe dehydration.
Efficacy of Fluid Therapy in Cats
After having undergone intravenous fluid therapy, the cat should show improvement within a couple of hours. That said, if there is a serious underlying condition it will take time for the cat to fully regain its health, as fluid therapy in this context should be thought of as a management strategy and not a form of treatment. Intravenous fluid replacement therapy is much faster and more efficient than oral replenishment (i.e. simply drinking the water), as it enters directly into the bloodstream with no waiting period.
Fluid Therapy Recovery in Cats
Following the procedure, there will be a period during which the cat is much more alert and energetic than before the fluid therapy. It is important for owners to remember that this is still a recovery stage and they should limit the activity of the cat as much as possible, lest their symptoms return. In the case of injury especially, extra care should be taken to make sure the cat does not re-open their wounds either by biting (which is fixable with an e-collar) or by vigorous activity (which can be mitigated by keeping them indoors). The vet will also most likely want to schedule further visits in order to check the progress of recovery and refill any prescriptions for medication or painkillers. The vet might also wish for the cat to undergo fluid replacement at home, in which case they will provide the owner with instructions and equipment to carry out the procedure themselves.
Cost of Fluid Therapy in Cats
Owners will be pleased to know that the price for fluid therapy can be quite low, with many clinics charging around $100 inclusive of materials and diagnosis. However, fluid therapy is often administered as just one component of a larger treatment plan. Kits for at-home fluid therapy cost roughly $30.

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Cat Fluid Therapy Considerations
Although most fluid therapy procedures go off without a hitch, cat owners should be aware that there are some potential downsides. Pain and general discomfort is the first problem.Much like humans who have injections or give blood there will be residual pain and numbness after the procedure. There is also a slight risk of limb swelling and pain, as if the needle misses or over penetrates the vein, it will deliver the fluids into the surrounding tissues. Although not usually a life-threatening problem, this can be very uncomfortable for the patient. Infection is another risk, as needles that come into contact with dirt and grime can spread bacteria and viruses extremely easily. Fortunately, a competent vet will use a fresh, sterile needle and will takes steps to lessen the risk of an outside infection by cleaning the injection site.
Fluid Therapy Prevention in Cats
Despite many causes of kidney failure being hereditary and therefore almost impossible to avoid, owners can always strive to lessen the risk of their cat becoming dehydrated. Making sure to always have accessible fresh water (especially in summer) and not constantly relying on dry food will keep a cat's fluid intake at a healthy level. If the classic symptoms of dehydration do start to appear (e.g. dry gums, lethargy,  and infrequent urination), then taking the cat straight to the vet will help prevent more serious conditions from gaining a foothold.
Fluid Therapy Questions and Advice from Veterinary Professionals
tabby
Kiwi
16 Years

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Renal Failure
Hi! I am not able to administer subcutaneous fluids to my cat alone and the person who helps me is out of town for about a week and a half, do you think my cat will be OK until then or should I find a way to get those fluids in her? I do feed wet food twice daily with access to a running water fountain.
July 15, 2018
Answered by Dr. Michele K. DVM
0 Recommendations
Fluid therapy can be extremely important in maintaining hydration for cats in renal failure. I would try to find another person to help me while your other helper is out of town. Your veterinary clinic should be able to help you as well if you can't find anyone.
July 15, 2018
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domestic short hair
Freddie
12 Years

1 found this helpful

1 found this helpful

My pet has the following symptoms:
Normal Appetite, No Vomiting
Freddie, age 12, has crashed twice in 2 years. After first time, subq fluids revived him. No further care was advised. After 2nd time needed iv fluids for 2 days followed by subq fluids at home, which I've been doing for 2 months. He's grown irritated by the poking now that he feels well and for about a week all I could manage was 25 ml each time. My vet said to give him a break for a few days then start again. He's eating and drinking and acting completely normal. He's now gone 6 days with no subq fluid at all. Should I start it again? Is it better to get a little bit in than none at all? My vet says he needs it forever. Is that really true?
July 13, 2018
1 Recommendations
Without knowing why Freddie needs fluids I cannot say whether or not he needs it for life; in some conditions lifelong fluid therapy is indicated to maintain hydration, manage kidney failure etc… You should discuss with your Veterinarian why Freddie needs fluid therapy and what other management options you may have available. Regards Dr Callum Turner DVM
July 14, 2018
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stray
Murka
16 Years

1 found this helpful

1 found this helpful

My pet has the following symptoms:
Weakness
Hi my cat is almost 16 years old, she stopped eating last week and vomiting foam, she is now under IV since last Wednesday every 8 hours, (dextrose sodium chloride, furosemide, ranitidine, Ampicillin). She doesn’t have pain but she still doesnt eat or drink, how long she can survive with this condition? Blood test note SCR 2.40, urea 87.0, AST/GOT 98, ALT/GTP 168 Ultra sonography: left kids deny 38mm right kidney 31 mm both renal diverticuli are delat and corticomedullary junction are reduced Liver is smaller than normal Nd hyperechoic and gallbladder wall is thicker than normal , bladder is normal, abdominal mass is not visible, Radiology : abnormal bronchial and aging interstitial lung patterns are not visible Heart and great vessels are within normal limits right kidney is smaller than left kidney How long she can survive 😞☹️ She pee after every IV 3times
July 11, 2018

Answered by Dr. Michele K. DVM
1 Recommendations
Cats cannot go forever without eating, and depending on what Murka is being treated for, she may benefit from a feeding tube to supplement her intake. There are also appetite stimulants that she may benefit from. Without knowing more about her situation or what she is actually being treated for, it is difficult for me to say how long she may survive, but if she isn't responding to therapy, your veterinarian may need to consider other treatments.
July 11, 2018
Tnx a lot dr Michele king
July 11, 2018
Murka's Owner
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stray
Munchkin
3 Weeks

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Diarrhea
Shaking
Lethargy
Ear Mites
Recently picked up a stray my boyfriend and I found in the middle of the road about two days ago. Upon bringing him home we noticed there was a lot wrong with this little guy--not only was he not very active, he doesn't meow, won't eat or drink unless force fed, has severe diarrhea and has what I can only guess are mini seizures about once a day. I couldn't get him into a vet until this morning to which the doctor said he was extremely dehydrated with a potentially fatal GI infection. The doctor gave him the fluid injection between his shoulder blades and has me hand feeding him with kitten replacement formula every few hours along with his medicine every 8 hours. He's extremely frail and currently laying in a box with a heating pad on low and a fuzzy blanket. Was wondering if I should stick to strictly formula or should I also attempt to give him water? If so how long after the injection should I start trying? Also would I give him water from the tap? Dont want him getting any more dehydrated than he already is. Heres to hoping he pulls through.
July 7, 2018
0 Recommendations
For now give Munchkin the kitten replacement formula, that should be adequate to keep hydration is he is consuming a regular adequate amount; I don’t know what level of hydration he was at or how much fluid was administered so I cannot really say how long it would cover him for. I would continue to give the prescribed treatment for now and follow up with your Veterinarian if there are no improvements. Regards Dr Callum Turner DVM
July 8, 2018
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Persian
Precious
4 Years

0 found this helpful

0 found this helpful

My pet has the following symptoms:
She Felt Weak
Is it ok for my cat to nurse her babies after she got fluids therapy, they are 3 weeks old, i took her to the vet Monday morning at 8:20, she was there the whole day and overnight, I picked her up the next day Tuesday at 10:19 am, she is doing ok feels good but don’t know if it’s ok to feed her babies.
June 21, 2018

0 Recommendations
It all really depends on why Precious required fluid therapy and whether she was given any medications along with the fluids, you should call your Veterinarian (no need to visit) to ask them as I don’t know her medical history or why she needed fluids; but the short answer would be no, but check with your Veterinarian. Regards Dr Callum Turner DVM
June 21, 2018
She was on fluids because during her pregnancy she didn’t really gain weight, she had a very upset stomach, not everyday but after those 3 weeks after her babies were born she collapsed, that morning she felt weak and when we took her to the vet they said that she was dehydrated, and they put her on fluids, now, she is a very healthy cat, my fault that I did not take care of her when she was pregnant, like taking her to the vet for a regular check up, They did some kind of blood work and everything came out good, except that her glucose is somewhat not regular, but not bad, now they said she don’t have to be full time with her baby, I try to help her feeding the baby but it’s only 3 weeks and of course she needs her mom, no antibiotic administered to her or any medicine they told me.
June 21, 2018
Precious's Owner
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Cat
Rocky
5 Months

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Not Eating, Nauseous, Weak
Took my 5 month old kitten "Rocky" For IV FLuids today. The et said he gave im 75ml & this session took no longer than 30 mins... Is that duration substantial enough? Is that about the time it takes for this session & amount ? Please advise someone if you can ... Many thanks
Medium hair domestic
Nugget
2 Years

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Fever
My sweet nugget developed a fever of 106 out of no where. Came home from a trip after a few days and soon as I got home I noticed her acting very strange and our cat sitter hadn’t picked up on it, so we don’t know how long the fever had been going on. She was very lethargic and weak...she couldn’t even climb on the bed and she just wanted a dark corner in the bedroom which is unlike her. Took her to the emergency vet the next morning on sat and they can’t place why she is running such a high fever. No blockages in the X-ray and they said blood test is normal. Does that mean there is no way for her to be fighting anything? They gave her 500ml of Sq fluid therapy...but I’m not sure how long that will last. She still isn’t drinking and I’m not sure if it’s because of the fluid still in her system. She seems to be doing much better but still doesn’t have much of a appetite either.
Persian
Oreo
6 Years

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Vomiting
Lethargic
Not Eating
My cat is on the fluid therapy since last two days, and still isn’t showing any signs of being well, and isn’t eating by himself at all. Appreantly all his blood tests, liver tests and kidney test, blood sugar level, all of these are normal. Vet still couldn’t find what can be his reason for being so sick. He was throwing up all of a sudden, and is on antibiotics plus IV fluid therapy now, but I still can’t see Any changes. If anyone has any idea of what could be the reason, please help.
European long hair
Tchipi
3 Years

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Anemia
Kidney Failure
My cat was diagnosed with kidney problems. She goes to the vet regularly for subcutaneous fluids but after one of those sessions she became lethargic and did not have enough energy to walk around and go to the sand box. We took her to the vet again and she had a severe anemia. She had a blood transfusion and was admitted for a week. Are the fluids related to the anemia condition? Can they be responsible for it? She is at home now and takes a lot of meds to help with the anemia and a blood infection. The vet said she needs to go there again to have take more subcutaneous fluids but I am afraid that it will make it worse. Can the subcutaneous fluids somehow interfere with the anemia treatments?
house cat
Pippin
15 Years

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Pain And Discomfort
Hi My kitty, Pippin, was given fluids by my vet at 2pm today It is 9:30pm and she is hiding under the bed and is very grumpy and cries if I try pick her up. The vet gave her 200mls of fluid and when I brought her home she was fine. Must I be worried? Is this normal? She did not behave like this when she was given her first dose of fluids 3 weeks ago. But that was only 100mls. She's 15 years old and is usually chirpy and very friendly. She's clearly in pain and not happy. Must I wait it out and let the fluids be absorbed before panicking? She has the normal fluid lumps under her skin Is she just uncomfortable? Thanks, Feylin
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