There’s no surefire answer, as different octopuses can have different levels of toxins. Some are lower in toxins and some are higher in toxins. For the most part, though, octopus is a healthy food for cats. If you decide to give your cat octopus, be sure to monitor them closely while they eat it and never let them have any by themselves. Always give them some kind of kibble or small piece of meat as a backup if they seem to be having trouble digesting the octopus.