What tremorgenic mycotoxin poisoning actually is

Tremorgenic mycotoxins are compounds produced by mould growing on foodstuffs. The two most commonly involved are penitrem A and roquefortine (VPIS, "Mouldy Food and Tremorgenic Mycotoxins"). They're the same family of toxins behind dogs becoming seriously unwell after eating mouldy bread or blue cheese. There's nothing about "compost" as a category that causes the reaction. It's a reaction to mould toxins, full stop, and mould grows wherever the right food and moisture turn up, compost heap or otherwise.

Where vets say the risk comes from

The UK's Veterinary Poisons Information Service (VPIS) names the specific sources it sees causing tremorgenic mycotoxin poisoning in dogs: mouldy bread, mouldy dairy such as yoghurt and cream cheese, very mouldy blue cheese, mouldy fallen fruit and nuts, and "plant material and food waste rotting on a compost heap" (VPIS, "Mouldy Food and Tremorgenic Mycotoxins"). Vets Now, whose veterinary nursing team writes on garden hazards for dog owners, puts it just as directly: "Compost is usually full of mouldy food and garden waste. Some of this can produce mycotoxins, which are highly dangerous to dogs" (Vets Now, "15 Hazards to Avoid for a Dog-Friendly Garden," Racheal Marshall, Head of Clinical Nursing). Read across every source and the common thread is active mould growth on decomposing material. Not any one particular type of waste.

What "finished compost" means for a Reencle

A Reencle breaks food waste down in roughly 24 hours, then the output needs a further 3 weeks of curing before it counts as finished compost, around 30 days start to finish (reencle.co.uk, How It Works). That's a genuinely different process to a garden heap, which can sit wet, decomposing and mouldy for months, especially through a damp UK winter. So it's a fair question: does that curing period change the mould or mycotoxin picture?

It's also a question nobody has actually answered. No vet or toxicology source found distinguishes finished, cured compost from an active heap on this point, anywhere. Curing changes how the material looks and behaves. It has not been shown, by any source checked for this post, to change whether it's safe for a dog to eat.

For more on what curing achieves once compost is ready to use in the garden, see How Compost Benefits Plants.

What isn't known: the honest gap

Worth stating plainly rather than skating past it. No UK vet, toxicology or public health source has tested or commented on mould-spore or mycotoxin levels in finished, cured compost specifically, whether from a Reencle or any other composter. Reencle's own output hasn't been independently tested for this either. Every warning available, from VPIS and from Vets Now, treats "a compost heap" as a single, undifferentiated hazard. No active-versus-cured distinction is drawn anywhere in the material checked.

So the honest answer to "does curing make it safer" is: not confirmed, either way. Not "probably yes." Not "probably no." Genuinely unknown until someone tests it.

Symptoms to watch for and how fast they can appear

Signs of tremorgenic mycotoxin poisoning can start fast. VPIS is specific: "An animal can become unwell within 30 minutes but sometimes signs may take up to 3 hours to start" (VPIS, "Mouldy Food and Tremorgenic Mycotoxins"). Watch for tremors, often affecting the whole body, vomiting, a raised body temperature, twitching, panting and a raised heart rate. In severe cases this can progress to convulsions, coma and kidney injury (VPIS, "Mouldy Food and Tremorgenic Mycotoxins").

What to do if a pet eats compost

Move the pet away from the compost straight away. Don't try to make them vomit, and never give salt water to try to induce it (VPIS, "Mouldy Food and Tremorgenic Mycotoxins"). Then get advice straight away. There are two legitimate first calls here, not one: your own vet practice, or Animal PoisonLine on 01202 509000, a 24-hour advice line for owners run by VPIS, which charges for calls (VPIS, "Mouldy Food and Tremorgenic Mycotoxins"). VPIS's own guidance tells owners to "call Animal PoisonLine on 01202 509000 even if your pet is showing no signs to find out whether a trip to the vet is required." When you call, be ready to say what was eaten, roughly how much, and when, and take a sample with you if you're advised to bring the pet in.

Keeping compost secure day to day

The practical fix is the same regardless of what produced the compost. Keep a lid on the compost bin or caddy and keep it secured. Don't leave finished compost sitting out in a loose pile on beds where a dog can dig into it. Work it into the soil rather than leaving it exposed, and store bagged Compost Starter and any unused finished compost somewhere pets can't reach.

If you don't have anywhere to dig compost into, secure storage matters even more. See our guide on what to do with Reencle output if you have no garden for options that still keep finished compost away from pets.

What a UK vet nursing lead says about compost and dogs

Racheal Marshall, Head of Clinical Nursing at Vets Now, is named as the source on the organisation's guidance for dog owners on garden hazards. Writing on compost specifically, the Vets Now team states: "Compost is usually full of mouldy food and garden waste. Some of this can produce mycotoxins, which are highly dangerous to dogs. Mycotoxicosis, which is poisoning by products contaminated by fungi, can be fatal. Always keep compost out of reach and seek urgent veterinary advice if you suspect your dog has raided the compost bin." (Vets Now, "15 Hazards to Avoid for a Dog-Friendly Garden," Racheal Marshall, Head of Clinical Nursing)

For the underlying mechanism, the Veterinary Poisons Information Service, which has provided advice to vets on managing animal poisoning cases for over 30 years, identifies the specific compounds involved and confirms they're produced by mould growing on foodstuffs, including material on a compost heap (VPIS, "Mouldy Food and Tremorgenic Mycotoxins").

Neither source distinguishes an active heap from cured, finished compost. That gap applies equally to Reencle's output and to any other compost.

Can dogs get sick from eating compost?

Yes. UK vets warn that compost can contain tremorgenic mycotoxins, toxic compounds produced by mould on decomposing material, which can cause tremors, vomiting and a raised body temperature in dogs, and can be fatal in severe cases (VPIS, "Mouldy Food and Tremorgenic Mycotoxins").

Does finished compost pose the same risk as an active compost heap?

No source found says either way for certain, so treat them the same. No UK vet or toxicology source distinguishes cured, finished compost from an active, decomposing heap on mould or mycotoxin risk, so the same precautions apply regardless of how finished the compost looks.

How quickly do symptoms of mycotoxin poisoning appear in dogs?

Symptoms can start within 30 minutes, and sometimes take up to 3 hours to appear (VPIS, "Mouldy Food and Tremorgenic Mycotoxins"). Don't assume a clear first hour or two means a pet hasn't been affected. Watch closely regardless.

What should I do if my dog eats compost?

Move them away from the compost immediately and don't try to make them sick. Call your own vet practice, or Animal PoisonLine on 01202 509000, a 24-hour owner advice line, straight away, even if they're not showing symptoms yet (VPIS, "Mouldy Food and Tremorgenic Mycotoxins").

Is Reencle compost more dangerous to pets because it processes meat and dairy?

No UK vet or toxicology source specifically compares mould risk in protein-inclusive processed compost against plant-only garden compost, so the same universal precautions apply regardless of what went into the composter. This hasn't been studied publicly either way.

The bottom line

Reencle turns everyday scraps into compost in around 30 days, but finished compost still needs to be kept well away from curious pets, just like any other compost.

And the scraps? Mouldy bread ends, leftover cheese rinds nobody's going to eat, and windfall apples or plums from the garden are exactly the kind of scraps that, left loose in an open caddy or on the ground, are what UK vets warn dogs get into. Left out like that, they're also headed for landfill, where they add to UK household food waste rather than being put to any use. Putting them into a Reencle instead means they're processed inside a closed unit rather than sitting in an open bin or spread across the garden waiting to be found. It also means less time spent worrying about what's accessible in the kitchen bin between collections.