A fishy smell on a cat can come from the rear end, mouth, genital area, or fur, and the location helps narrow down what to discuss with a veterinarian. A strong odor near the anus may come from pungent anal sac fluid; persistent bad breath can have dental or other medical causes. Smell alone cannot diagnose the problem. If your cat strains to urinate and passes little or no urine, seek emergency veterinary care.
Start by finding where the smell is strongest
Notice whether the odor seems to come from your cat’s mouth, rear end, genital area, skin, or fur. Also note when you notice it and whether it is persistent or recurring. Location and accompanying signs are useful information for a veterinarian, but they are not a home diagnosis.
- Rear end: Look for scooting, persistent licking, irritation, swelling, redness, or discharge.
- Mouth: Notice persistent bad breath, oral discomfort, or changes in eating.
- Genital area or litter box: Watch for frequent licking, discharge, redness, swelling, changes in urination, or straining.
- Skin or fur: Check whether the odor is localized or present more generally, and mention it along with any other changes.
What can cause a fish-like smell?
Pungent anal sac fluid
Cats have two small anal sacs beside the anus. They normally release a pungent secretion during defecation. If a sac becomes impacted or infected, the odor and local discomfort may become more noticeable. Scooting, persistent licking, irritation, swelling, redness, or discharge around the anus are reasons to contact a veterinarian. Infection can progress to an abscess, so swelling or discharge beside the anus warrants prompt veterinary attention.
Anal sac disease is not common in cats, but it can occur. VCA notes that factors associated with it include obesity, chronic diarrhea or constipation, inflammatory bowel disease, allergies, and abnormal anatomy or neurologic function. If the problem recurs, a veterinarian can assess possible contributing factors and recommend a treatment plan.
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Persistent bad breath
A healthy cat’s breath should not be offensive, according to Eric Davis, DVM, a fellow of the Academy of Veterinary Dentistry and former director of Cornell’s Dental Referral Service. Periodontal disease is a common cause of bad breath, but material caught around the teeth, oral sores or injury, and some kidney, liver, respiratory, or metabolic conditions can also be involved. The odor itself cannot tell you which cause is responsible, so persistent bad breath deserves veterinary assessment.
If the odor is clearly from the mouth, tooth brushing can help disrupt plaque as part of routine dental care. Use products made for cats, not human toothpaste. Dental hygiene is not a substitute for an examination when bad breath persists.
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Genital or urinary problems
Persistent genital licking, foul odor between eliminations, discharge, redness, swelling, urinary straining, or increased urination are signs to discuss with a veterinarian. The possible causes vary and may require an examination or tests to identify. A fish-like smell alone does not establish that a cat has a urinary infection.
Repeated attempts to urinate, crying, blood in the urine, or frequent genital licking warrant veterinary attention. Straining while producing little or no urine—especially with increasing distress—can indicate a urethral obstruction. This is an emergency requiring immediate veterinary treatment.
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What to do next
- Observe and take notes. Record where the odor is strongest and when it occurs. Note scooting, licking, discharge, swelling, mouth discomfort, appetite changes, vomiting, or litter-box changes.
- Contact your veterinarian. Arrange an assessment for persistent or recurring odor, or odor accompanied by irritation, abnormal discharge, pain, or changes in eating or elimination.
- Go for emergency care if urination is blocked. If your cat strains but passes little or no urine, seek immediate veterinary treatment, particularly if your cat seems distressed.
- Avoid treating the smell yourself. Do not try to express your cat’s anal sacs or give medication based on odor alone. A veterinarian can examine your cat and decide whether testing or treatment is needed.
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