Yes, Split Leaf Philodendron is toxic to dogs!
Dogs accidentally consuming the Split Leaf Philodendron plants can show the following clinical symptoms: Vomiting, Prolonged Depression, Incoordination, Hypersalivaton, Sleepiness Or Excitation, Dilated Pupils, Low Body Temperature, Low Blood Pressure, Coma, Seizure And Death (In Rare Cases).
Split Leaf Philodendron consumption is also toxic to Cats.
Toxic Principles Of Split Leaf Philodendron: Insoluble calcium oxalates.
More Info About The Split Leaf Philodendron Plant
Scientific Name: Philodendron bipennifolium
Family: Araceae.
Also known as: Horsehead Philodendron, Cordatum, Heartleaf Philodendron, Panda Plant, Fiddle-Leaf, Fruit Salad Plant, Red Emerald, Red Princess, Saddle Leaf.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.