Dulse (Palamaria palmata) is a red seaweed common in Irish waters. Traditionally, it has been used as an anti-helminthic due to its high levels of kainic acid which studies show is a potent antihelminthic (shuts down egg growth).
Pumpkin seeds are an effective anti-helminthic too, proven in studies to be as effective as Panacur (contains Fenbendazole), the most common chemical anti-helminthic used in pets. It works by reducing adult worm motility.