Why is my cat vomiting and pooping black liquid? Is it serious?

These are very serious signs and require urgent vet assessment. It sounds like he has a bleed in the stomach or bowel and i would recommend blood tests to rule out internal complicating factors such as kidney or liver disease as soon as possible

Black or tarry stool is a serious and concerning symptom that can sometimes indicate a bleed in the stomach or upper GI tract. Other issues such as parasites, food allergies, or ingestion of certain items may also cause the stool to darken or change colors. If Rowan continues to act oddly, has additional dark or tarry stool, or shows new symptoms of illness, seeking veterinary care in person ASAP is best.

Hello. Thank you for your question. I know this must be very scary for you. Generally seeing black stool is a sign that there is blood in the feces. When it is black in color, that means that the blood has been "digested" or is coming from somewhere internally. This is something very serious and you are already seeing some of the issues that will arise. Your cat is probably weak because there is a significant amount of blood being lost. If at all possible you need to take her to a vet ASAP. There are many places that are open on a limited basis or emergency clinics and even vets who will travel to your home. I hope you get the help you need and Please feel free to contact me through a one on one consultation is you have further questions.

This could definitely be because of the change of food but the black color concerns me that there may be digested blood present. Since she is so young and tiny, I would consider this urgent so I would try to get her into the vet soon. I would that she may become dehydrated or sicker if it isn't addressed. Your vet will likely want to run a fecal on her to check for any intestinal parasites. They may also want to know the food you are feeding her. I hope this helps and she starts to feel better soon.

I can see that the vomit has blood in it, which can be caused by stomach ulcers. Dark feces can also be an indicator of digested blood in the stool, which occurs with ulcers. Ulcers can be caused by a number of underlying conditions such as chronic foreign bodies, diet, or kidney disease. The sneezing can be a sign of pain or unrelated to the vomiting (concurrent upper respiratory or lung disease). I recommend having your cat seen by a vet right away. They will likely recommend bloodwork and x-rays to diagnose and localize the issue and begin an appropriate treatment plan. I hope all is well and am happy to answer any other questions you may have!

There are a number of concerns here but the development of blacker stools can be indicative of internal bleeding and requires urgent veterinary assessment and a check up of kidney function and dental health (swallowed blood can be detected in stools). It sounds like she has also suffered from colitis and/or pancreatitis (soft, slimey, malodorous) in the past and diet change to a high fiber, low fat complete food may help depending on the findings of her physical exam and blood/urine tests

Poor Harley! I can see that her vomit is dark and grainy. This can be a sign of gastric bleeding, which can be caused by ulcers, foreign bodies, and certain parasitic infections. Ulcers can be caused by an overdose of certain pain medications, steroids, or occur on their own. I recommend having Harley seen by a vet right away as these conditions can be very painful and even life threatening. I hope all is well and that Harley feels better soon!