7 reasons we’ve given our cats Katsuobushi for a thousand years (and why it quietly keeps their kidneys clear)
1. In Japan, our cats live past 25 — and it starts with their kidneys
Most American cats don’t make it past 12. Ours routinely live to 25 and beyond. It is not the food. It is not the breed. It is not genetics.
It’s one thing we’ve given our cats here for a thousand years — something almost nobody in the West knows about. In Japan we call it katsuobushi. You’d call it bonito: a fish that’s dried and shaved into flakes. It’s naturally loaded with what a cat’s kidneys need to clear out the waste that quietly builds up inside them every day. That’s the whole secret — the trouble is getting the real thing outside Japan.
That’s what HappyWags AIM fixes. It’s built around freeze-dried bonito, so all you do is add one scoop to the food your cat already eats. No pills. No diet change.
The best part? Your cat thinks it’s a treat. You know it’s a daily kidney cleanout — and peace of mind against the scary vet bills down the line.
“I gave my cat taurine every morning for two years and thought her kidneys were covered. Then a friend who lived in Tokyo told me what they actually feed their cats over there. So I tried this.
She comes running for it like I’m opening tuna, and her last blood test held steady.”
2. Cats go WILD for bonito — Japan even has a saying about it
Here’s the part that surprises people: to your cat, this doesn’t look or taste like a supplement at all. It smells like dinner. She eats it, licks the bowl, and looks up for more. But it isn’t just a treat — it’s quietly looking after her kidneys the whole time.
And unlike most supplements, she never refuses it. You know the drawer: the capsule she spat out, the chew she sniffed once and walked away from. Most supplements look great to humans, but cats couldn’t care less.
Bonito is different. In Japan we have a saying — neko ni katsuobushi, “bonito to a cat” — for a temptation nothing can resist. There’s even a woodblock print from 1842, now in the British Museum, of cats shaping their bodies into the word for bonito. HappyWags AIM is made from freeze-dried bonito, which is why most cats come running for it.
It’s the rare combo of a treat and real kidney support — a win for both cat and parent.
“I’ve thrown away so many kidney supplements. This is the only one she actually eats on her own. To her it’s a treat… and meanwhile it’s doing something for her kidneys! I’m happy to spend on something that’s actually good for her long-term.”
3. Protects your cat’s kidneys and saves you from $1,000 vet bills
Your cat’s kidneys filter everything she eats — every meal, every day, for her entire life. And unlike most organs, kidney cells don’t regenerate. Once they scar, they’re gone. This is why kidney disease is the number one killer of cats: it’s silent, it’s cumulative, and by the time most owners find out, a third of the kidney is already gone.
1 in 3 cats will develop it. Most look completely fine until it’s far along.
This is exactly what we’ve always guarded against in Japan. The old rule isn’t complicated: take care of their kidneys first. Everything else follows from that. Most cat parents want to do something — but nothing in her regular food was ever built to clear that daily buildup.
HappyWags AIM handles it the way bonito always has — every scoop gives her kidneys what they’ve been missing, so they stay clear and keep working the way they should. No guilt, no fight, no scary bills later.
“I always felt like I should be doing something about her kidneys and I didn’t know what. My neighbor spent almost $5,000 on her cat’s last year and I was terrified. Then I found out cats in Japan have been eating bonito for centuries. Mine is 13 now and still hops onto the bed every night.”
4. Softer coat, better appetite, and the energy she used to have
In Japan, we have a word for a cat that is quietly declining — otonashiku natta. “She has become quieter.”
Cats hide almost everything. The coat that got a little rough. The naps that got a little longer. The jump onto the windowsill that quietly stopped happening. That is not only age. That is a body working harder than it should — kidneys that are no longer keeping up, even if the bloodwork hasn’t caught it yet.
This is the other half of why we give them katsuobushi every day. When the kidneys can keep up, the small things come back first — appetite, then the coat, then the energy. You notice it gradually, the same way you missed it going the other direction.
A soft coat. Clear eyes. A cat who still jumps onto the counter.
5. It’s never too early to start — and it’s never too late
Most people wait for a reason. A number that moved. A vet who used the word “monitor.”
In Japan, nobody waits. We have a dish called nekomanma — rice with bonito flakes — that Japanese families have fed their cats alongside themselves for generations. Kittens get it. Old cats get it. There is no age where it stops making sense.
Waste builds from the first day and never stops, so a healthy three-year-old and a fifteen-year-old both get something out of the same scoop. And if she’s already been diagnosed, whatever kidney function she still has is worth protecting.
You don’t have to work out whether it’s the right moment. It already is.
“My girl was already stage 2 when I found this and I nearly didn’t bother. I thought I’d missed the boat. Eight months on she’s put the weight back on and she’s brighter than she’s been in a year. I only wish I’d started when she was five.”
6. Give it to her every day without a worry
I hear from American cat owners sometimes. They went looking for help and found capsules from sites they’d never heard of. Labels they couldn’t read. Doses they couldn’t verify. Some of them made their cats sicker. Every one of them describes the same feeling — the stomach-drop of wondering what they just gave their cat.
Bonito is what cats here have always eaten. HappyWags AIM puts it in a daily scoop, made the careful way: every ingredient and every dose printed right on the label. Made in the USA. Third-party tested. Gentle enough for every day, at any age, next to whatever else she’s already on.
Instead of hoping you picked a good one, you get to check.
“I almost bought capsules off a site I’d never heard of. Something felt off. I couldn’t even read half the label. With this one I could see exactly what was in it, right down to the milligrams. That’s honestly what sold me.”
7. Cat parents can’t stop talking about it
For generations, this stayed in Japan. Real katsuobushi is hard to find in the West, and the bonito-flavored cat treats sold there copy the taste, but not the nutrients a cat’s kidneys need. That’s why HappyWags built AIM. Not just the taste — the real thing, with what her kidneys need, in one daily scoop.
Now, with over 7,800 reviews and 50,000 cat parents, it’s quickly become the go-to kidney supplement for cats in America. From softer coats to steadier checkups, the results speak for themselves.
“She’s sixteen. She still climbs onto the back of the sofa every evening, still yells at me at five in the morning, still has the softest coat of any cat I’ve had. I started her on this at eleven and I’ll never not have it in the house.”
Limited Time Summer Sale – 100% Risk Free!
In Japan, cats have eaten bonito every day for a thousand years. Not occasionally. Not when there’s a sale. Every day.
That’s the whole idea — one scoop, every day, starting now. The longer you wait, the more of that daily buildup goes unaddressed.
Over 95% of cats go wild for it. And if yours is one of the rare 5% that won’t touch it, the 60-day guarantee means you risk nothing.
There’s a Summer Sale running right now — you’ll see the exact offer on the next page. But the daily habit is what matters. Today is as good a day as any to start it.
