Are Arborvitae Trees Toxic To Dogs? | What Owners Should Watch

Arborvitae can bother some dogs’ stomachs if chewed, and the sap and oils may irritate the mouth, but severe cases are uncommon.

Arborvitae hedges look tidy, stay green, and pop up in yards everywhere. Dogs also love to mouth leaves, snap twigs, and chew anything that smells new. Put those together and you get a common worry: “Is this plant going to hurt my dog?”

This article gives you a clear, calm way to judge risk after a nibble, spot warning signs, and decide what to do next. It also helps you lower the odds of a repeat bite without turning your yard into a fenced-off museum.

Are Arborvitae Trees Toxic To Dogs? What The Science Says

Arborvitae is the common name used for several Thuja species. The plant contains aromatic oils and resins that can irritate tissues. When a dog chews a decent amount, you may see drool, lip smacking, a sore-looking mouth, vomiting, loose stool, or a dog that won’t eat dinner.

Most pet exposures come from a quick chew on fresh tips or small fallen sprigs. That kind of bite tends to cause mild stomach upset at most. Problems can grow when a dog eats a larger portion, keeps returning to the plant, or is small-bodied and prone to upset stomachs.

Another detail: the strongest plant oils are more concentrated in essential oils than in the shrub itself. That’s one reason a bottle of plant oil is a different risk profile than a few green sprays from the hedge.

Why Dogs Chew Arborvitae In The First Place

Most dogs aren’t picking arborvitae as a snack. They’re doing dog stuff. Common triggers include:

• Teething and mouth play: Young dogs chew to ease gum soreness and to pass time.
• Boredom: A quiet yard plus a reachable hedge can turn into a daily habit.
• Texture: Springy foliage and thin twigs feel satisfying to crunch.
• Scent: The leaves release a strong smell when crushed, which can keep a curious dog coming back.
• Chasing and pouncing: Dogs dart into hedges after squirrels and come out with a mouthful of plant.

If your dog chews plants often, it doesn’t mean something is “wrong.” It usually means the yard offers chew targets that beat the toy pile. You can fix that with a few simple changes later in this article.

What Parts Of Arborvitae Cause Trouble

The foliage and small twigs are the usual culprits. When chewed, they release sticky sap and fragrant oils that can irritate the lips, tongue, gums, and stomach lining. That irritation is why symptoms tend to be mouth-related and GI-related.

Seeds and cones are less common as a target, yet they can still upset a stomach if swallowed in quantity. Bark is more of a mechanical issue; a dog that strips bark may swallow rough pieces that can trigger gagging or stomach discomfort.

Risk Changes With The Dog, The Amount, And The Pattern

Three factors matter most:

• Body size: A small dog can feel the same bite more than a large dog.
• Amount eaten: A few nips is different from a mouthful swallowed.
• Repeat chewing: Small daily chews can keep the gut irritated.

Also watch the “plant prep” factor. Fresh green tips contain more aromatic compounds than dried brown clippings. A dog that gets into a pile of fresh trimmings may get a bigger dose in one sitting.

Signs You Might See After A Chew

Most signs show up within a few hours. In many homes, the first clue is the sound of gagging or repeated lip licking. Common signs include:

• Drooling or foamy drool
• Pawing at the mouth
• Refusing food or treats
• Vomiting once or a few times
• Loose stool
• Mild tiredness

More concerning signs can include repeated vomiting, weakness, wobbliness, tremors, or a dog that seems “not right” in a way you can’t shake. Those signs are not the usual outcome from a small nibble, yet they are a signal to call a clinic right away.

What To Do Right Now If Your Dog Ate Arborvitae

Start with a quick, no-drama check. Your goal is to stop more chewing, clear the mouth, and decide whether home watch is enough.

Step 1: Stop Access And Check The Mouth

• Move your dog away from the plant and bring them indoors.
• Look for leaves stuck between teeth or under the tongue.
• If you can safely do it, wipe the lips and gums with a damp cloth.

Step 2: Rinse, Don’t Force Anything

You can offer a small drink of water to rinse the mouth. Skip saltwater, milk “fixes,” or home mixtures. Also skip forcing anything down your dog’s throat.

Step 3: Don’t Induce Vomiting On Your Own

Inducing vomiting can backfire, especially if a dog is drowsy or already retching. If a vet wants vomiting induced, they’ll tell you when and how.

Step 4: Collect The Details A Vet Will Ask

Write these down while it’s fresh:

• When the chewing happened (time)
• What was eaten (fresh tips, twigs, clippings)
• Rough amount (a few bites, a mouthful, a pile)
• Your dog’s weight and age
• Current signs (drool, vomit count, stool changes)

Those details often decide whether a clinic visit is needed or if a watch-at-home plan is enough.

When To Call A Vet And When To Go In

Many cases are mild. Still, it’s smart to call if you’re unsure, since dogs can react differently. Use these practical triggers:

Call A Vet The Same Day If You See Any Of These

• Vomiting more than once
• Diarrhea that keeps going
• A swollen-looking mouth or trouble swallowing
• Marked drooling that won’t ease
• Ongoing refusal to eat
• You know a large amount was eaten
• Your dog is small, older, or has a history of stomach issues

Go To An Emergency Clinic Now If You See Any Of These

• Tremors, collapse, or severe weakness
• Wobbliness or a “drunk” gait
• Repeated vomiting with no break
• Breathing trouble
• Signs that escalate fast

Plant oils can irritate the gut, and concentrated oils can also cause nervous system signs in some poison exposures. Merck’s veterinary guidance on essential oil toxicosis lists GI signs and neurologic signs that can show up after exposure to potent oils. Merck Veterinary Manual’s essential oil toxicosis overview is a solid reference for the pattern of signs clinicians watch for.

If you can’t reach your clinic, a poison hotline can guide next steps based on your dog’s weight, the plant, and the signs you’re seeing. The ASPCA Animal Poison Control Center lists its 24-hour contact options and basic intake details.

How Vets Handle Arborvitae Chewing

There’s no single “antidote” for a shrub chew. Treatment is usually based on signs and on how much was eaten. A typical clinic plan may include:

• Mouth care: Rinsing the mouth and checking for irritation.
• Gut settling meds: Anti-nausea meds or protectants when vomiting is active.
• Fluids: Given under the skin or by IV if vomiting or diarrhea is draining your dog.
• Observation: Watching for tremors, worsening weakness, or dehydration.

If the chew was recent and the dose seems large, a vet may use decontamination steps that fit your dog’s condition. The point is to limit absorption and keep your dog stable while the irritation calms down.

How Much Arborvitae Is “Too Much” For A Dog

There isn’t a tidy “X leaves equals Y risk” rule you can trust for every yard and every dog. Plant potency varies by species, season, and how fresh the material is. Dogs also vary in sensitivity and in how fast they vomit after a bite.

So the better approach is a pattern-based risk check: amount eaten, size of dog, and signs seen so far. Use the table below as a field-friendly way to think about it without guessing grams.

Exposure Pattern	What You Might Notice	Practical Next Step
One or two nips of fresh tips	No signs, normal eating	Rinse mouth, watch 6–12 hours
Several chews with some swallowing	Drool, lip licking, mild gagging	Call clinic for advice, monitor closely
Chewed twigs and swallowed bits	Vomiting once, soft stool	Call clinic the same day
Ate from a pile of fresh clippings	Repeated drool, nausea, belly sounds	Call clinic now; plan may change fast
Repeated chewing over days	On-and-off vomiting or diarrhea	Schedule vet visit; stop access
Plant oil exposure (diffuser spill, bottle lick)	Vomiting, lethargy, wobbliness, tremors	Emergency clinic now
Dog is tiny, elderly, or has GI history	Signs can appear with less chewing	Lower your threshold to call
Chewing plus another hazard (mulch, fertilizer, bait nearby)	Mixed signs or fast decline	Emergency clinic now; bring product info

Common Mistakes That Make A Mild Chew Worse

These are the slip-ups that turn a simple plant nibble into a longer night:

• Letting the dog “sleep it off” with no check: If vomiting starts, dehydration can creep in.
• Giving random home meds: Some human meds are dangerous for dogs.
• Feeding a heavy meal right after vomiting: A bland, small meal later is often easier on the gut.
• Leaving clippings on the ground: Fresh cuttings are easy to binge on.
• Assuming it’s only arborvitae: Dogs often chew multiple yard items in one roam.

Watch-At-Home Plan For Mild Cases

If your dog took a small nibble, looks normal, and your clinic agrees that home watch is fine, use a simple plan. The goal is to catch worsening signs early and keep the stomach calm.

For The Next 12 Hours

• Offer water as normal. Don’t push huge amounts at once.
• Hold treats and rich chews for the rest of the day.
• Watch for repeated swallowing, drool, vomiting, or loose stool.
• Check gum moisture: sticky or dry gums can hint at dehydration.

If Vomiting Happens Once And Stops

Many dogs bounce back after one vomit. Keep food light and small when you reintroduce it. If vomiting repeats, call a vet.

Second-Table Decision Check: Signs And Timing

This table helps you make a fast call based on what you see and when it started. It’s not a replacement for a clinic, yet it’s a clean way to sort “watch” from “call.”

What You See	When It Starts	What To Do
No signs, normal behavior	0–6 hours after a small nibble	Home watch, block access, note any change
Drooling, lip licking, mild mouth irritation	Minutes to a few hours	Rinse mouth, call clinic if it lasts
Vomiting once, then normal	1–6 hours	Call clinic for guidance; bland feeding later
Vomiting twice or more	Any time	Call clinic now; dehydration risk rises
Diarrhea that keeps going	Within 24 hours	Call clinic the same day
Wobbliness, tremors, collapse	Minutes to hours	Emergency clinic now

How To Stop Arborvitae Chewing Without Replacing The Whole Hedge

You can keep the hedge and still lower risk. The easiest wins are about access and habit.

Block The Bite Zone

• Use a short garden fence or wire barrier around the base for a few weeks.
• Raise the lower skirt of the plant by pruning the lowest branches so the “snack zone” is out of reach.
• Pick up clippings right away. Don’t leave a pile overnight.

Give A Better Chew Option

If your dog likes crunchy plant texture, rotate safe chew toys and offer them in the same spot where chewing usually starts. Make that corner the “toy corner.”

Train A Simple Interrupt

Teach “leave it” with treats indoors, then practice near the hedge on leash. Keep sessions short. Reward fast disengagement. Over time, the hedge loses its pull.

Reduce Unsupervised Yard Time During The Habit Phase

If your dog is in a daily chew habit, letting them roam alone keeps it alive. A few days of supervised breaks can reset the pattern.

Safer Yard Planning If You’re Planting New Shrubs

If you’re choosing shrubs from scratch and you know you have a plant-chewer, pick plants that are less tempting: less aromatic oils, fewer soft tips, and less “snackable” texture near ground level.

Even with safer picks, no plant is guaranteed chew-proof. Dogs will chew mulch, sticks, and soil edges. The best yard setup is one that mixes smart plant choice with training and chew outlets.

Printable One-Page Checklist For Arborvitae Incidents

Save this as a quick reference for the next time you spot chewing.

• Move dog away from the plant and bring indoors
• Check mouth for stuck leaves and wipe lips/gums with a damp cloth
• Offer a small drink of water to rinse the mouth
• Write down time, amount, and which part was eaten
• Watch for drooling, pawing at mouth, vomiting, diarrhea, weakness
• Call a clinic if vomiting repeats or signs last
• Go to emergency care for tremors, wobbliness, collapse, breathing trouble
• Clean up clippings and block access to the hedge base

If you’re on the fence, trust your gut. You know your dog’s “normal.” A fast call often saves a long night.