Can Dogs Eat Parsley? A Science-Backed Look at This Common Herb
Wondering if parsley is safe for dogs? Discover the truth about curly vs. flat-leaf parsley, health benefits, risks, and how to feed it safely. Written by canine nutritionist Sally Barker.
Parsley. It’s a humble kitchen herb often tossed on meals as a garnish—but for dog owners, it raises a surprisingly common question: Can dogs eat parsley safely?
The short answer is: Yes — but only the right type, in the right amount, and for the right reasons. As a qualified canine nutritionist, I see a lot of confusion about herbs and their role in our dogs’ diets. Let’s unpack what the science says about parsley and dogs, which type is safe, how it can support canine health, and when you should avoid it.
What Is Parsley?
Parsley (Petroselinum crispum) is a member of the Apiaceae (carrot) family and comes in two common varieties:
Curly Leaf Parsley (Petroselinum crispum)
Flat-Leaf or Italian Parsley (Petroselinum neapolitanum)
Both contain a range of bioactive compounds that contribute to their antioxidant, anti-inflammatory, and antimicrobial properties. But not all parsley is equal when it comes to dogs.
Is Parsley Safe for Dogs?
Yes — curly leaf parsley is considered safe for dogs in small amounts and may even offer some health benefits.
However, flat-leaf (Italian) parsley should be avoided in large quantities due to its higher concentration of furanocoumarins—natural compounds that can be toxic to dogs in large doses or with regular ingestion.
🚫 Important Warning
Avoid parsley if your dog is pregnant, has kidney issues, or is taking medications affected by diuretics or blood clotting, as parsley can act as a mild diuretic and contains vitamin K.
Nutritional Composition of Parsley
Per 100g of raw curly parsley (USDA FoodData Central):
Vitamin K: 1640 mcg (more than 1000% of daily human requirements!)
Vitamin C: 133 mg
Vitamin A: 8424 IU
Folate: 152 mcg
Iron: 6.2 mg
Calcium: 138 mg
Antioxidants: Luteolin, apigenin, and myristicin
These compounds are known to have antioxidant, antimicrobial, and anti-inflammatory properties that may benefit canine health when used correctly.
Potential Health Benefits of Parsley for Dogs
1. Freshens Breath
Parsley’s chlorophyll content can help neutralise bad odours in the mouth—making it a popular ingredient in natural dog breath treats.
Tip: This is not a substitute for dental care. Always address the root cause of bad breath, which can signal dental disease or digestive issues.
2. Natural Antioxidants
Parsley is rich in flavonoids and carotenoids that help fight oxidative stress, which has been linked to aging, joint problems, and chronic disease.
Studies show flavonoids like apigenin and luteolin may support anti-inflammatory pathways in mammals (Harborne & Williams, 2000).
3. Supports Detoxification
Parsley contains chlorophyll, which may aid in detoxification pathways in the liver. However, evidence in dogs is limited and largely extrapolated from rodent models (Yamamoto et al., 2001).
4. May Support Urinary Health
Historically, parsley has been used as a mild diuretic, encouraging urination and helping flush the urinary tract. This may benefit dogs prone to mild UTIs or water retention—but should be avoided in those with kidney problems.
When Parsley Is NOT Safe for Dogs
Large amounts of flat-leaf parsley
High in furanocoumarins, which are linked to photosensitivity and potential liver issues in large doses.
Dogs with kidney disease
Due to its diuretic effect, parsley may increase fluid loss and place strain on the kidneys.
Pregnant dogs
Parsley may stimulate uterine contractions, so it should be avoided during pregnancy.
Dogs on blood-thinning medication
Parsley’s high vitamin K content may interfere with anticoagulants like warfarin.
How Much Parsley Can Dogs Eat?
Use parsley as a garnish or food topper, not a main ingredient.
Safe Serving Sizes (Curly Leaf Only):
Small dog (<10kg): 1/4 tsp finely chopped fresh parsley
Medium dog (10–25kg): 1/2 tsp
Large dog (25kg+): 1 tsp
Serve no more than 2–3 times per week, and always start small to assess tolerance.
How to Feed Parsley to Dogs
Fresh & finely chopped on top of meals
Mixed into homemade treats or meatballs
Blended into bone broth or lick mat pastes
Sprinkled into slow-cooked meals post-cooking
Never feed parsley essential oil or extracts unless prescribed by a veterinary herbalist.
DIY Dog Treat: Fresh Breath Parsley Bites
Ingredients
15g (1/2 cup) chopped curly parsley
10g (1/4 cup) mint leaves
1 tbsp coconut oil
1 egg
150g (1 1/2 cups) oat flour - can use other flours
Water (as needed)
Method
Preheat oven to 160°C (320°F).
Blend parsley, mint, and egg.
Mix with flour and coconut oil to form a dough.
Roll into balls or shape into bones.
Bake for 15–18 minutes.
Cool and store in the fridge for up to 1 week.
Tip: Use sparingly and monitor for any signs of tummy upset or allergy.
Scientific References
Harborne JB, Williams CA. Advances in flavonoid research since 1992. Phytochemistry. 2000;55(6):481-504.
Yamamoto Y, et al. Chlorophyll-derived compound reduces oxidative stress in mice. J Agric Food Chem. 2001;49(10):5581-5585.
Biesalski HK, et al. Micronutrients and brain function in ageing. Br J Nutr. 2010;104(S3):S10–S16.
Signs Your Dog May Have Eaten Too Much Parsley
If your dog has accidentally eaten a large quantity of parsley, especially flat-leaf:
Vomiting or diarrhoea
Lethargy
Excessive drooling
Increased photosensitivity (light reaction)
Unusual behaviour
Call your vet if you suspect toxicity.
What About Dogs With Health Conditions?
Kidney Disease: Avoid due to diuretic effect
Liver Disease: Caution; parsley contains oxalates
Pregnant Dogs: Strictly avoid
Dogs on Medication: Check with your vet before using parsley if your dog is on diuretics, anticoagulants, or meds for heart or liver disease
Want to Know What Else Is Safe (Or Not) for Your Dog?
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“Can my dog eat spinach?”
“Is garlic safe for dogs?”
“What fruits are toxic to dogs?”
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Final Thoughts from The Canine Dietitian
Parsley can be a functional herb in your dog’s diet when used with knowledge and caution. It’s not a miracle cure, but it’s a lovely, nutrient-dense addition to meals or treats when used appropriately.
Remember — more is not better. And when it comes to herbs and dogs, the right information makes all the difference.
