A friend of mine came home from a ten-day ayahuasca retreat in the Sacred Valley and, within an hour of walking through her front door, her cat refused to come near her. Not for a day. For almost three weeks. The same cat that used to sleep on her chest now flattened its ears every time she entered the room. Eventually things settled. But she still talks about it, six years later, with the same puzzled half-laugh.

If you spend any time in plant-medicine circles, you hear stories like this constantly. Someone comes back from ceremony and their dog acts strange. A coworker says “you feel different” without being told anything. A partner wakes up at 3 a.m. crying from a dream they can't explain. The person who drank the brew didn't say a word — and yet something seems to have followed them home.

What's actually going on here? Is it suggestion, projection, a sensitive nervous system reading subtle cues? Is it something the rationalist worldview hasn't got language for yet? I want to walk through what people actually report, what the indigenous frameworks say about it, and what to do if you're the one who came back from a retreat carrying — well, whatever it is you're carrying.

The phenomenon people are actually describing

Let's get specific, because vague spiritual talk helps nobody. The reports tend to cluster into a few recognisable shapes, and they show up across cultures and across decades of ayahuasca tourism.

• Animals — especially cats, dogs, and horses — reacting strongly to someone freshly returned from ceremony. Sometimes drawn closer than usual. More often, briefly wary.
• Children noticing without being told. A toddler pointing at empty corners of the room. A six-year-old asking why mum has “light around her head.”
• Partners or roommates having unusually vivid dreams in the first week home, sometimes with imagery that matches the returnee's visions — imagery the returnee hasn't described.
• Sensitive friends — the ones who already meditate, do bodywork, or work in trauma therapy — saying something like “you feel bigger” or “there's something with you” the moment you walk in.
• Plants in the house perking up, wilting, or otherwise behaving oddly. (Yes, this one comes up a lot. No, I can't explain it.)

None of this is universal. Plenty of people come home from ceremony and nothing strange happens at all — the dog is fine, the partner is fine, the houseplants are fine, and the only weird thing is how badly you want to quit your job. But the cluster of reports is consistent enough that dismissing it entirely feels lazy.

How the traditions frame it

In the Shipibo, Asháninka, and broader Amazonian lineages, ayahuasca isn't conceptualised as a drug. It's a being. A teacher. A relationship. When curanderos talk about the brew they use words like madre — mother — and they describe her as having agency, preferences, and a presence that doesn't end when the ceremony does.

From inside that framework, the question “can other people sense the spirit of ayahuasca on me?” isn't strange at all. Of course they can. You spent a week in deep contact with something the tradition treats as alive. Why would that contact evaporate the moment you board a plane home? The Shipibo concept of mariri — the spiritual force a healer carries — assumes that prolonged work with master plants leaves a residue on the person. Sensitive beings, including animals and children, are thought to perceive it directly.

You don't have to buy the metaphysics to find the framework useful. Even the most committed materialist has to admit that something measurable changes in a person after intensive ceremony: nervous-system regulation shifts, default-mode network activity is altered for weeks, pheromonal output may change with stress and sleep patterns, micro-expressions soften. Animals and children read those signals far better than adult humans do. Whether the “spirit” is literal or a useful name for a constellation of subtle changes is, frankly, a question above my pay grade.

Is it suggestion, or is something actually happening?

Here's where I have to be honest: I don't know. Nobody really does. The research is thin to non-existent — there's no peer-reviewed study on whether cats can tell their owner did ayahuasca last week, and there probably never will be.

What I can say is that suggestion clearly accounts for some of it. If you come home glowing and tell your partner you had a profound encounter with a jaguar spirit, and then your partner dreams about a jaguar that night, the parsimonious explanation is that you planted the seed. Brains are pattern-matching machines, and dreams are particularly suggestible.

But suggestion can't account for all of it. Animals don't speak English. A toddler doesn't know mum just spent four nights drinking a sacrament in the jungle. When a dog who has lived with you for nine years suddenly refuses to make eye contact for forty-eight hours, something is registering, and it isn't a story you told.

My working stance — and you're free to disagree — is that the body of a person who has been through intensive plant-medicine work is genuinely different for a while. Different scent profile, different breath rhythm, different micro-movements, different gaze. The mystery isn't whether something is being perceived. The mystery is what to call it.

What to do if you're the one who came back changed

If you're researching a retreat and reading this kind of thing freaks you out a little — good. It should. Going to ceremony is not like booking a yoga weekend. You are signing up to be rearranged, and some of that rearrangement is visible to people who love you. Worth thinking about before you book.

A few practical notes from people who've walked this road:

1. Tell the people in your house you're going. Not the marketing version. The real version. “I'm going to drink a traditional Amazonian medicine for four nights. I might come back quiet. I might come back weird. Please be patient with me for a couple of weeks.” This single conversation prevents most of the friction.
2. Plan a buffer day, ideally two. Don't fly home and go straight to a Monday morning meeting. The re-entry is the part nobody warns you about, and it's where the strangeness lands hardest.
3. Be gentle with the animals. If your dog or cat acts off, don't take it personally. Sit on the floor. Let them come to you. They almost always come back within a week.
4. Don't over-narrate the experience. Especially in the first month. Telling the full story to everyone who asks tends to either flatten the experience into entertainment or freak out people who weren't ready to hear it. A short, honest version (“it was hard and important”) is usually enough.
5. Get integration support. A therapist who actually understands psychedelics, a circle of people who've sat with the medicine, or a facilitator who offers post-retreat calls. Not a forum at 2 a.m. when the strangeness peaks.

The honest caveat about plant medicine and other people

One thing the retreat brochures rarely mention: ayahuasca and other master plants change relationships, not just individuals. The person who comes home is not exactly the person who left. Sometimes the partner is delighted. Sometimes the partner is unsettled. Sometimes a friendship that ran on a particular kind of cynicism doesn't survive the shift.

People considering plant medicine for addiction, depression, or stuck patterns often focus on what they hope will change inside them. Fair enough. But the relational ripple is real, and it's worth naming before you go. The healing is rarely contained to the cup you drink from.

This is also why the question of where you sit matters as much as whether you sit. A reputable retreat — one with experienced facilitators, real screening, and an actual integration arm — will prepare you for the re-entry. A weekend operation run by someone who learned the songs from a YouTube playlist will not. If something here speaks to you, the available ayahuasca and plant-medicine retreats can be browsed and booked on our marketplace here, and I'd encourage you to read each one's preparation and aftercare protocols carefully before committing.

The cat, by the way, eventually went back to sleeping on my friend's chest. She thinks the medicine took about three weeks to settle. The cat hasn't said.