Cat Spraying Fishy Smell. I can't think of anything associated with rabbits that i would call a fishy smell. Having her glands emptied regularly by your vet can help curb such odors.
It’s not your cat, to be honest. I've look around her anus she doesn't have any discharge coming from there. Although they normally release their smelly liquid while using the bathroom, sometimes their anal glands become full and may be released randomly around the house, especially.
A sexually mature kitten, usually around 6 months old or more, may begin spraying odorous urine around your home if she isn't spayed or neutered.
Her sister/littermate lives with us too but shows no signs of these problems. It’s not your cat, to be honest. Usually clients will describe a funky, musky, “fishy” odor occasionally emanating from their cat. If your vet can take her in today that would be great so he could get her hydrated while she is there.