Why Slugs & Snails Are a Danger to Dogs
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Slugs and snails. Slow, slimy, weirdly determined little garden goblins.
They might not look like much of a threat, but for dogs, they can carry a hidden danger: lungworm. And no, your dog does not need to be the type of creature who purposely crunches a snail like a forbidden garden snack to be at risk.
Dogs can come into contact with slugs, snails and their trails through grass, outdoor toys, water bowls, puddles and all the other delightful things they investigate with their curious noses (and tongues).
The good news? You don’t need to set up a perimeter around your garden to stop your furbaby from merrily snuffling their senses away in case they come into contact with one of these slimy critters.
But… you do need to know the risks, the symptoms to watch for and how to reduce the chance of lungworm becoming a problem.
Table of contents
Are slugs and snails dangerous to dogs? What is lungworm in dogs? How do dogs come into contact with slugs and snails? What happens if my dog eats a slug or snail? Signs of lungworm in dogs Are slug and snail trails dangerous to dogs? Are puppies more at risk from slugs and snails? Can slug and snail pellets harm dogs too? How to reduce the risk of lungworm from slugs and snails When should you call the vet?
Are slugs and snails dangerous to dogs?
Yes, slugs and snails can be dangerous to dogs because they can carry lungworm larvae.
Lungworm is a parasite that can cause serious illness in dogs. In the UK, the main concern is Angiostrongylus vasorum, a type of lungworm that can affect the heart, lungs, blood vessels and wider body.
Dogs can become infected if they swallow infected slugs, snails or sometimes even frogs (it’s been known to happen!). However, they may also be exposed through contaminated grass, puddles, outdoor bowls or toys that have been left outside.
The thing is, not every slug or snail carries lungworm.
And not every dog who sniffs one suspiciously will become unwell. But because lungworm can be serious and, in some cases, fatal, it’s one of those risks worth taking seriously before your dog decides the patio is an all you can eat gastropod buffet.
What is lungworm in dogs?
Lungworm is a parasitic infection, though, despite the name, it's not just a “lung” problem.
Once inside a dog’s body, lungworm can travel through the bloodstream and affect the heart, lungs and blood vessels. This can lead to breathing problems, coughing, tiredness, bleeding issues and other symptoms that can be tricky to spot at first.
The basic lungworm life cycle looks like this:
Infected dogs or foxes pass lungworm larvae in their poo
Slugs and snails pick up the larvae
Dogs swallow infected slugs, snails or contaminated material
The larvae develop inside the dog
The infection can then cause illness, sometimes with vague or easily missed symptoms
That is why prevention matters.
Lungworm is much easier to protect against than to deal with once your dog is poorly.
How do dogs come into contact with slugs and snails?
Some dogs eat slugs and snails deliberately. We don’t know why. Dogs are beautiful, loyal, intelligent animals and also occasionally absolute carnage in a fur coat.
But, aside from those few, many dogs are exposed accidentally. They might swallow a tiny slug hidden in grass, lick a snail trail from a toy or drink from an outdoor water bowl that has been visited overnight.
Common risk points include:
Eating slugs or snails in the garden
Chewing grass where tiny slugs may be hiding
Drinking from puddles
Drinking from outdoor water bowls
Playing with toys left outside overnight
Licking or chewing chews, balls or bowls that have been in damp areas
Sniffing through compost, soil, plant pots or long grass
Eating frogs, which can also be involved in the lungworm cycle
Puppies and curious dogs can be especially prone to this because their entire approach to the world is basically, “can I put it in my mouth?”
What happens if my dog eats a slug or snail?
If your dog eats a slug or snail, don’t panic (10 points if you read that in Uncle Albert's voice…). Not every slug or snail is infected with lungworm and a single incident does not automatically mean your dog will become ill.
That said, you should still take it seriously.
If you see your dog eat a slug or snail:
Remove any remaining slug or snail from their mouth if it's safe to do so
don't try to make your dog sick unless your vet specifically tells you to
Check whether your dog’s parasite treatment includes lungworm protection
Contact your vet for advice, especially if your dog is a puppy, elderly, unwell or not currently protected
Monitor your dog closely for any changes in breathing, energy, appetite, digestion or behaviour
The most important thing is not to assume your dog’s usual wormer covers lungworm. Not all worming treatments protect against lungworm, so it's best to check with your vet rather than guessing.
Signs of lungworm in dogs
Lungworm symptoms can be frustratingly vague. Some dogs show clear breathing issues, while others simply seem “not quite right” at first.
Signs of lungworm in dogs can include:
Coughing
Breathing difficulties
Getting tired more easily than usual
Lethargy
Reduced appetite
Weight loss
Vomiting
Diarrhoea
Behaviour changes
Unexplained bruising
Nosebleeds
Bleeding that does not stop as expected
Pale gums
Seizures in severe cases
Collapse in serious cases
The tricky part is that these symptoms can also be caused by plenty of other health problems.
So if your dog seems off, especially after possible slug or snail exposure, it’s best to speak to your vet rather than waiting to see if things improve.
Are slug and snail trails dangerous to dogs?
Slug and snail trails are not something you want your dog licking like a Michelin-starred tasting menu.
The main lungworm risk comes from dogs eating infected slugs or snails, but slime trails may also potentially carry lungworm larvae. This is why outdoor toys, bowls and chews can become a concern if they are left in the garden overnight or in damp areas where slugs and snails are active.
So, to be safe, always:
Bring toys inside overnight
Wash outdoor bowls regularly
Avoid leaving chews outside
Change garden water bowls daily
Stop your dog licking slimy trails where possible
Keep food bowls indoors rather than outside
You don’t need to inspect every blade of grass like a slug detective. Just reduce the easy contact points.
Are puppies more at risk from slugs and snails?
Puppies are not necessarily more attractive to lungworm, but they are more likely to come into contact with risky things.
Why? Because puppies explore with their mouths. Grass? Mouth. Leaf? Mouth. Snail shell? Horrifyingly, mouth.
Puppies may be more likely to:
Eat things from the garden
Chew toys left outside
Lick bowls, grass or paving
Drink from puddles
Pick up slugs or snails without you noticing
Because puppies are still developing and can become unwell quickly, it's best to speak to your vet about a parasite plan that is suitable for their age, weight and lifestyle.
Can slug and snail pellets harm dogs too?
Yes, slug and snail pellets and some garden chemicals can also be dangerous to dogs.
This is a separate risk from lungworm, but it typically comes up at the same time because owners are trying to keep slugs and snails away from the garden. Some slug control products can be toxic if eaten by dogs, so always check whether any product is genuinely pet safe before using it.
If your dog eats slug pellets or any garden chemical, contact your vet immediately. If possible, keep the packaging so your vet can see exactly what your dog may have ingested.
For dog friendly slug control, consider safer garden habits first:
Remove slugs and snails manually where practical
Keep grass shorter
Clear damp hiding spots
Avoid leaving dog food outside
Use pet safe garden products only
Keep compost and plant debris away from curious noses
The goal is simple: fewer slugs, fewer snails, fewer mystery snacks.
How to reduce the risk of lungworm from slugs and snails
You cannot bubble wrap your pooch every time they step outside. What you can do is make lungworm exposure less likely and make sure your dog has the right protection in place.
Speak to your vet about lungworm prevention
This is the big one.
Not all worming treatments protect against lungworm. Some over the counter wormers only cover certain types of worms, so it's important to ask your vet whether your dog’s current parasite protection includes lungworm.
Your vet can recommend the right product based on your dog’s:
Age
Weight
Health
Lifestyle
Local lungworm risk
Exposure to gardens, parks, wildlife and wet outdoor areas
Bring toys and bowls indoors
Slugs and snails are most active in damp conditions and overnight. If your dog’s toys, bowls or chews are left outside, they can become accidental slug meeting points.
Bring them inside at night and wash them regularly.
Change outdoor water bowls daily
Outdoor water bowls are useful in warm weather, but they can also attract garden visitors. Change the water often, clean the bowl and avoid leaving it outside overnight where possible.
Stop your dog drinking from puddles
Easier said than done, obviously. Some dogs see a puddle and think, “Vintage rainwater, excellent.”
But puddles can be contaminated with all sorts of things, including slug and snail contact. Encourage your dog to drink clean water before walks and carry water on longer outings.
Pick up poo promptly
Foxes and infected dogs can pass lungworm larvae in their poo, which helps continue the parasite’s life cycle. Picking up after your dog is not just polite, it also supports parasite control.
Keep grass short and reduce damp hiding spots
Slugs and snails love damp, sheltered areas. You can make your garden less inviting by:
Cutting long grass
Clearing piles of leaves
Moving unused pots or clutter
Keeping compost areas secure
Avoiding standing water where possible
You will not eliminate every slug or snail, but you can reduce the slug nightclub vibe.
When should you call the vet?
Call your vet if your dog has eaten a slug or snail and you are unsure whether they are protected against lungworm.
You should also contact your vet if your dog shows any of the following signs:
Coughing
Breathing changes
Unusual tiredness
Reduced appetite
Vomiting or diarrhoea
Weight loss
Behaviour changes
Unexplained bruising
Nosebleeds
Bleeding that seems unusual
Pale gums
Weakness or collapse
Seek urgent veterinary help if your dog is struggling to breathe, collapsing, bleeding heavily or having seizures.
Lungworm can be treated, but early advice matters. Your vet may recommend testing, monitoring or a specific worming treatment depending on your dog’s symptoms and risk.
Final thoughts
Slugs and snails might be small, slow and deeply unglamorous, but they can pose a real risk to dogs because of lungworm.
That does not mean your dog can never enjoy the garden again. It simply means a few small habits can make a big difference.
Check their parasite protection, bring bowls and toys inside, avoid puddle drinking where possible and speak to your vet if your dog eats a slug or snail.
Because when it comes to garden snacks, your dog has many questionable opinions. Lungworm prevention is one area where you get to be the sensible adult in the room.
FAQs
Are slugs poisonous to dogs?
Slugs are not usually poisonous in the same way some chemicals or toxic plants are, but they can still be dangerous because they may carry lungworm larvae. If your dog eats a slug, contact your vet for advice, especially if they are not on parasite protection that covers lungworm.
Are snails dangerous to dogs?
Yes, snails can be dangerous to dogs because they can carry lungworm. Not every snail is infected, but dogs should still be discouraged from eating them. If your dog has eaten a snail, check their lungworm protection and speak to your vet if you are unsure.
What should I do if my dog ate a slug or snail?
If your dog has eaten a slug or snail, remove any remaining material from their mouth if safe, then contact your vet for advice. Do not make your dog sick unless your vet tells you to. Your vet may ask about your dog’s age, size, health, symptoms and current worming treatment.
Can dogs get lungworm from licking slug and snail trails?
Dogs are most commonly exposed by eating infected slugs or snails, but slug and snail trails may also pose a potential risk. To reduce exposure, avoid letting your dog lick slimy trails and bring outdoor bowls, toys and chews inside overnight.
How can I stop my dog eating slugs and snails?
Supervise them in the garden, especially in damp weather or at night, keep grass shorter, remove slugs and snails where practical and bring toys and bowls indoors. Teaching a strong “leave it” cue can also help with dogs who treat the garden like a buffet.
