The Kitty Up Publication · Summer Edition · 2026

Feline Era

Science, care, and the everyday experience of living with cats.

Person in a kayak with a cat wearing a life jacket on a body of water.
Cover story
Behavior

Why Does Cat Litter Smell? Ammonia Causes and How to Fix It

Litter box odor comes from ammonia, moisture, bacteria, and residue that builds up in the box itself. Here's why it happens, how to stop it, and when a change in your cat's urine is...

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The Feline Gut Health Series

The Feline Gut Health Series breaks down what cat parents should know about digestion, probiotics, the microbiome, and everyday gut health. We separate solid evidence from emerging research and explain it in plain English. No hype, just practical feline-focused guidance.

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Part 1

Signs of a Healthy Cat

A healthy cat is not defined by one behavior. Learn what to watch across appetite, grooming, movement, play and the litter box, and why changes from your cat’s own normal matter most.

2

What Is the Cat Gut Microbiome, and What Actually Disrupts It?

Published · 7 min
 3

Cat Diarrhea and Probiotics: What the Evidence Actually Shows

Published · 5 min
 4

How Antibiotics Affect Your Cat's Gut Microbiome

Published · 4 min
 5

Cat Probiotics: Strain IDs, CFU and What Matters

Published · 7
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Kitty Up
From the Feline Era Desk

Observations from fostering, caring, and paying close attention.

Years of fostering and caring for cats have taught me that the smallest changes often say the most. This is where I share what I have learned by watching closely, asking questions, and putting cats first.

Stacey Rhee - Founder, Kitty Up
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