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Why does my cat have diarrhea and bloody stool after vaccine?

Updated On September 23rd, 2025

Pet's info: Cat | Russian Blue | Male | neutered | 1 year and 10 months old | 12 lbs

I took my cat to a vaccination clinic today for some shots. Since coming home he has had some diarrhea and bloody stool. Other than seeming tired he is acting relatively normal. Is this stress or vaccine related?? Should I be immediately concerned? Thank you!

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on June 17th, 2018

It can be stressed related from the vaccines causing Moshi's diarrhea and bloody stool. Given that he's acting relatively normal, I wouldn't be immediately concerned. I can give you a home remedy to see if that helps. I recommend withholding food for 12-24 hours, then feeding a bland diet of boiled white meat chicken (no bones) in small amounts several times a day for a couple of days. Then slowly add back in his normal diet. If this does not help the diarrhea and bloody stool, or he develops other symptoms such as anorexia, vomiting, and lethargy, then I would be concerned and take him into the vet. Best of luck, I hope this helps!

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2Pet Parents found this answer helpful

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My 2 month old kitten has been having diarrhea for the last 4 days. Hence we immediately got his vaccination and deworming done. He was getting better but suddenly he passed very loose stools with mucus and blood in it. I have attached photos. The
This can commonly occur after intestinal parasites or stress from vaccinations. Your cat most likely need some antibiotics and possibly a probiotic to help get the gut health back to where it needs to be. Once this occurs the diarrhea should resolve. I hope this helps. Thanks for using Boop by Petco. Best of luck.
Updated on September 24th, 2025
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For the first time, I noticed mucousy, bloody diarrhea around my indoor cat's anus after he passed a smelly stool. He is a 1 1/2 year Siamese tabby point mix, and we have also been catsitting another cat for 2 days. He's been very agitated/aggressi
I'm sorry to hear that Casper has had so much diarrhea lately! Yes, it is certainly possible that the stress of his visitor coupled with his ingestion of the other cat's food and treats could have caused some gastroenteritis (inflammation in the gastrointestinal tract), which led to diarrhea. A bit of blood can occur in the stool as a result of irritation to the colon. If Casper is still eating, drinking and acting relatively normally, you can try a home remedy. Start by withholding food for 24 hours, then offer a bland diet of boiled white meat chicken for a few days before gradually mixing his normal food with the boiled chicken over another 5-7 days. If at any point Casper becomes lethargic, starts vomiting, has profuse bloody diarrhea, or stops eating, he will need to take a trip to the vet for further evaluation. I hope this helps and that all goes well!
Updated on September 24th, 2025
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I have a 6 month old am shorthair that maybe showing distemper symtoms (bloody stool) but still eating and drinking playing ect ive dewormed her 2 times but i have her vaccine combo and need to know if i should give it to her or not i dont have money
Thanks for using Boop by Petco! I would not give the vaccine if Kitty isn’t feeling well. If she has an infectious disease the vaccine will not prevent it from getting worse. Bloody stool could be from a virus, a bacterial infection, a GI foreign body, or parasites. Even if you have dewormed her, not all dewormers get every parasite. If the bloody stool continues I would recommend borrowing money to have her seen by a vet. Good luck and kisses to Miss Kitty!
Updated on September 24th, 2025
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Hello so recently I changed my cats food and since that she had thrown up a little bit and seems to not make it to the litter box and blood in her stool. Could it be the cat food because I have another cat and she is fine.
Yes, it can be the food even though your other cat is ok. Each cat will react different to a diet change, and it sounds like this diet change may be upsetting Frosty's stomach. I can give you a home remedy to try to see if that helps. I recommend withholding food for 12-24 hours, then feeding a bland diet of boiled white meat chicken (no bones) in small amounts several times a day for a couple of days. Then slowly add back in her normal diet. If the vomiting continues in the absence of food or on the bland diet, she stops eating, becomes lethargic, or she continues to have blood in her stool, I would have her seen by a vet.
Updated on September 24th, 2025
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Hi! My cat has recently had an episode of bloody diarrhea. It wasn't a very large amount.. She's been vomiting pretty much all of her life with diarrhea here and there. She uses the litter box a lot, maybe goes number two a few times a day. I'm worri
The blood you are seeing in the stools may be stress colitis. I suggest you do the following: 1. Put her on a GI supplement for diarrhea that also has probiotics: https://worldtails.securevetsource.com/itemView/view/198944_HomeDelivery.pml?productId=132480 2. Put her on a GI food that will help with digestion: https://worldtails.securevetsource.com/itemView/view/198944_HomeDelivery.pml?productId=114749 3. Use some Feliway diffusers in your new place until she seems more comfortable. These really help with stress: https://worldtails.securevetsource.com/itemView/view/198944_HomeDelivery.pml?productId=117324 This is what I would start with. Hope this helps. Best wishes!
Updated on September 24th, 2025
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My cat is a manx. I think he is 9 months but not for sure. I pick him up off of the streets and do not know what shot or vaccines he has had. He has had blood and diarrhea in his poop. Whenever I pick him up his stomach like lurches.
Hemorrhagic diarrhoea must be resolved first before injecting any type of vaccine. Different are the possible causes of it, starting from dietary related ones, gastrointestinal parasites or generic viral/bacterial infection. Standard vaccinations are against Leukemia Virus (FeLV), Rhinotracheitis (Herpes virus), Calicivirus, Parvovirus (RCP).
Updated on September 24th, 2025
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my 2 months old cat had a bloody stool today how can I treat it until Monday because all vets near me are closed tommorow
You can help her get through this by feeding bland food (i.e. boneless cooked chicken). Feed small portions (1 tablespoon or less) at meal time. You can also add probiotics to the food (can get this at the pet store), which has demonstrated some efficacy for improving diarrhea. Ensure fresh, clean water is always available. Blood in diarrhea is always concerning, so she should definitely go to the vet as soon as possible. I hope this helps and Simba gets better soon.
Updated on September 24th, 2025
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Rosie is our 9 week old kitten. We rec'd Rosie a week and a half ago. She seemed healthy and happy. I brought her for her FvRCP vaccine. Since then, she eats very little and has had a very small amount of blood in her bm. Today the blood was a larg
HI, thanks for using Boop by Petco! Poor Rosie! I am sorry she isn't feeling well! I am worried that Rosie is having a vaccine reaction the the FVRCP. I recommend that you take her to your Vet for a recheck. They likely will give her anti-nausea medications, fluids under the skin and medication for her diarrhea. They may even give her a steroid injection for the vaccine reaction. She is very little and dehydration can set in quickly. The blood is likely from inflammation in the colon. Other causes for vomiting and diarrhea in a young kitten are: intestinal parasites, viral or bacterial infections, dietary indiscretion, food sensitivity and toxins. I hope this helps and I hope Rosie is back to herself very soon!
Updated on September 24th, 2025
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My cat has diarrhea he is a indoor cat and has been dewormed already. Could he be stressed from us not being around for 4 days we were on vacation.
It could be possible that stress from being left alone could lead to the diarrhea, but it could also be caused by a GI illness, eating something rotten, or a foreign body. I can give you a home remedy to try to see if that helps him. Withhold food for 12-24 hours, then feed a bland diet of boiled white meat chicken (no bones) in small amounts several times a day for a couple of days. Then slowly add back in his normal diet. If the diarrhea continues on the bland diet, he starts vomiting food, stops drinking water, starts vomiting water, or becomes very lethargic, he will need to see a vet right away. Best of luck, I hope this helps!
Updated on September 24th, 2025
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My cat had a vet appointment on Saturday and everything was fine she got 2 shots ( dewormer and the 1 year booster) all of a sudden today she had diarrhea, I’ve only noticed once so far today, there’s been no food changes or anything different from h
Deworming treatments as well as vaccines can cause diarrhea as a side effect. I wouldn't be concerned about Rae just yet, and I can give you a home remedy to see if that helps. Withhold food for 6 hours, then feed a bland diet of boiled white meat chicken (no bones) in small amounts several times a day for a couple of days. Then slowly add back in her normal diet. If the diarrhea continues on the bland diet, she starts vomiting food, stops drinking water, starts vomiting water, or becomes very lethargic, she will need to see a vet right away. I hope this helps!
Updated on September 24th, 2025

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