Are processionary caterpillars a danger to pets when hiking in Mallorca?

The threat processionary caterpillars pose to pets on the island often goes unnoticed until a curious dog investigates one during a walk in the countryside or Tramuntana hills. These caterpillars, especially common in pine forests around Sóller or near Alaró, carry tiny hairs that release toxins causing painful reactions and even severe allergic responses in animals. Dogs are especially vulnerable because their inquisitive nature leads them to sniff or bite these insects, resulting in symptoms like swelling, drooling, or difficulty breathing that demand urgent veterinary care.

While horseback riders and wildlife enthusiasts might overlook this risk, smaller animals such as cats and even farm livestock can also be affected. It’s wise to keep a close eye on your pets whenever walking along trails on the Ma-10 or while exploring pine-lined beaches such as Cala Mondragó. Local vets around Palma and Manacor are familiar with these cases during spring and early summer when the caterpillars are most active. Staying informed and steering pets clear of visibly clustered caterpillar nests can prevent frightening encounters and keep your companions safe throughout your visit.