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Because he has worms and needs to go to the vet. Seriously!

(The above, not written by me...)

The previous is a potentially irresponsible reply.

Google search "yellow mucus discharge cat anus" for more information.

Long story short, all cats and dogs have anal sacs that secrete this discharge.

The exact function of these sacs is called "unknown" by more sites than otherwise.

The discharge will have a sour odor and is considered "normal" UNLESS

the area around the anus is swollen and/or the discharge is excessive.

Observe the behavior of the animal to determine is a vet visit is needed.

Impaction of the anal gland can occur, and vets will be able to expel the gland, suggest dietary changes, give antibiotics antibiotics, or in more extreme reoccurring cases suggest removal of the gland.

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15y ago

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