My cat's poop is black and she's hyper. Is this a serious health issue?

Black stool is concerning as that may indicate a bleed in the upper GI tract such as the stomach. If he is also vomiting and has had this ongoing for several days it would be best to seek out veterinary care in person ASAP.

Yes liver can cause very dark stools. But if this continues once she is on her regular cat food I would be worried something else could be going on. Black tarry stools can be caused by ulcers in the stomach. If Stella continues to have dark stool I would have her evaluated by her veterinarian.

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

Hello! If Bella hasn't been eating anything new, I am concerned that her black-colored feces could be a serious, potentially life-threatening situation. Black, tarry stools usually indicates bleeding in the upper gastrointestinal tract. Potentially, she could have a retained fetus, which could be causing internal damage. I highly recommend that you get her to the vet as soon as possible, for her life and the life of her kittens. Good luck, and I hope Bella feels better soon!

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.

Thank you for using Petco Pet Education Center, formerly Petcoach! Melena is essentially digested blood in the stool. This can be caused by bleeding in the stomach or intestines caused by ulcers, inflammation, clotting abnormalities, or a foreign body. I recommend having Billy seen by a vet as soon as possible to determine the cause of the bleeding. Your vet can perform bloodwork or an ultrasound to diagnose the cause.

Hello, sorry to hear about Odin. It looks like he has a severe infection, however I cannot tell you based on those results where. With he signs you are seeing, I would worry that he could have a kidney infection or a GI ulcer or even a GI perforation. Particularly the tarry stools make me concern that he could have an upper GI bleed from an ulcer or perforation. I would actually recommend having him evaluated now or as soon as possible by an emergency or your primary veterinarian. It sounds like he may actually require to be hospitalized and be treated aggressively with medical management. Hope this helps and best of luck.