Causes and solutions for smelly cat butts:
1. Constipation or indigestion can lead to retained and decaying feces. Provide your cat with high-fiber food and increase its water intake. You can also add some laxatives or detoxifying foods.
2. Excessive or blocked glandular secretions around the anus; take your cat to the vet for an examination and treatment of the glandular secretion problem;
3. Infectious diseases, such as intestinal or urinary tract infections. Take your cat to the vet for treatment, such as antibiotics. 
4. Excessive intake of fish food can lead to a strong and pungent odor; gradually reduce the amount of fish food your cat consumes and increase its intake of a balanced diet to ensure dietary diversity.
5. Skin problems such as mange and eczema can cause local skin inflammation or infection. Take your cat to the vet for treatment of skin problems, such as antibiotics and medicated baths.
6. Bacterial infection, such as perianal gland inflammation, perianal inflammation, etc.; take your cat to the veterinarian for examination and treatment or surgery based on the examination results.
7. Gastrointestinal issues, such as excessive constipation or indigestion. Check and adjust your pet's diet, adding appropriate amounts of high-fiber foods to help them digest and eliminate waste better.
