My 12-year-old cat has sudden dark, thick diarrhea. Is it serious?

Diarrhea can be a sign of a number of different diseases ranging from hyperthyroidism to infections to inflammatory bowel disease or even intestinal cancer. Some of these diseases can be fatal if left untreated, and regardless of the cause of the diarrhea if it goes on it could lead to dehydration and nutritional deficiencies. I think you need to see a veterinarian - you could look into Care Credit as a payment option, or you could ask your local shelter if there is any subsidized veterinary care near you. www.carecredit.com

Chronic diarrhea in an older cat with vomiting can be a sign of an inflammatory bowel disease or intestinal cancer. The only way to differentiate between the two disease is a surgery to take biopsies of the intestines and have them analyzed. Based on the diagnosis, the diet may be changed or vitamin supplements or steroids may be added to manage her symptoms. They will check for parasite and check her labs for any renal or endocrine disease

Poor Lily! Diarrhea even in old cats isn't normal. I have diagnosed parasites especially giardia in cats who are strictly indoors. You could try a sensitive stomach food and some probiotics to see if this helps. If not, I would strongly recommend your vet to take a look at her. Your vet will likely do a fecal and possibly blood work, thyroid test and x-rays. I would also make sure they rule out giardia and campylobacter. In older cats, I worry especially worry about inflammatory bowel disease and GI cancer. If your vet is concerned about this, they will be able to talk to you about potential diagnostics (Ultrasound and GI panel, etc) and treatments to help her feel better. I hope this helps and she starts to feel better soon!

Poor Milo. This frequent diarrhea in a cat his age could be caused by stress, pancreatitis, or hyperthyroidism. Hyperthyroidism can be common in senior cats. He needs to see a vet for this problem, and I recommend getting a geriatric blood panel and urinalysis done. These tests are tailored to senior cats and look for diseases like hyperthyroidism. Once the cause of the diarrhea is found, the vet can discuss treatment options. Please take him into a vet in the next few days. I hope this helps!

Poor Kila! The diarrhea could be due to many conditions including eating something she shouldn’t have, bacterial over growth, parasites or even organ disease. If the diarrhea has continued beyond 24 hours, I recommend to have her examined by the veterinarian. With continued diarrhea, there are often bacterial shifts in the gut that will make matters worse regardless of the initial cause. Make sure to bring in a sample of fresh stool. The doctor will check her for parasites and bacterial over growth. Many times a bland diet can help and then a slow, gradual introduction to the normal food can be done. A bland diet can consist of 25% boiled white meat chicken and 75% boiled white rice. This should all be plain. This link also has good information: https://www.petcoach.co/article/diarrhea-in-cats/ I hope your kitty starts feeling better quickly! Please feel free to post any additional questions.

Please have her assessed by a vet as soon as possible, the abdominal enlargement in the face or persistent vomiting and diarrhea is a huge concern. Fluid build up , liver disease and tumors are all possibilities, early diagnosis is required in order to fully assess all options for her care

Kitty should be examined by a vet to determine the cause. He could have hyperthyroidism and your vet can run blood-work to test his thyroid level. Once your vet determines the exact cause, he/she can recommend a treatment. Hope he feels better soon.