Common Australian Plants That Can Trigger Contact Allergies in Dogs

1. Wandering Jew / Zebrina (Ground-Cover Plants)

Plants like Wandering Jew (also known as Zebrina), turtle vine, purple heart, and moses-in-a-cradle are popular ground covers but can cause itchy skin reactions for dogs who walk or lie on them repeatedly. These plants are common in Australian gardens and can rub against a dog’s belly, legs or chin during play. 

2. Grasses (Contact & Pollen Sensitivities)

While grass is everywhere, some types — like Buffalo grass, Kikuyu and Couch grass — may trigger contact irritation or worsen seasonal skin allergies in dogs, especially those with sensitive skin. Dogs that roll, lie down, or dig in grass are more likely to get redness or itching on their belly, chest or paws. 

3. Grevillea Species (Native Plants That May Irritate Skin)

Grevillea shrubs are beautiful and common in Australian gardens — but some species and cultivars (like Grevillea robusta) are known to cause contact dermatitis in people and likely sensitive animals too. The fine hairs and plant oils can act as irritants if your dog brushes past them frequently. 

4. Stinging Tree (Gympie-Gympie & Giant Stinging Tree)

Found in rainforests of eastern Australia, the Gympie-gympie (Dendrocnide moroides) and the Giant Stinging Tree (Dendrocnide excelsa) have extremely painful hairs that can cause intense burning, itching and welts on contact. While more notorious for human reactions, curious dogs exploring bushland or rainforest areas can also be affected. 

5. Tar Tree (Semecarpus australiensis)

Also called the Tar Tree or Native Cashew, this rainforest tree contains resinous compounds that can trigger allergic skin reactions after contact. Like many members of its family, it can irritate sensitive skin — so keep dogs away from bark, leaves or fallen fruit.

Common Signs Your Dog Is Reacting to a Plant

Look out for these symptoms after your dog has been outdoors:

• Red, itchy skin patches

• Licking or chewing paws or belly

• Rubbing face or body against the ground

• Mild swelling or rash on contact areas

Tips to Reduce Contact Allergies

• Know your garden plants — mark which ones are likely to cause irritation.

• Remove all the possible culprit plants and see if symptoms persist

• Limit access for your dog to areas with known problem plants.

• Wipe or bath paws and fur after walks or playtime in green areas.

• Consider planting pet-friendly alternatives like bamboo, sedges, or clumping grasses recommended for dogs with sensitive skin (but always check for specific plant safety).