Seaweed and dogs

Sounds like you are taking about Sargassum Weed. Not positive but I doubt it is toxic. Might make him sick though. Does he really want to eat it or just tasting it or playing with it?

There has been a lot of published information and product promotion of green foods for people and pets in the last few years. Green foods can include sea vegetables and certain grasses. These foods are considered nutrient rich in amino acids, minerals, vitamins and the new ‘phytonutrients’, such as lycopenes and carotenes. Most are considered to be ‘whole foods’ in that they are complete foods and can be fed daily. Seaweeds are considered the best of these green foods, as they do not require cellulose to encircle the cell wall, which is difficult for dogs to digest. Seaweeds average about 25% protein and 2% fat. They are one of the richest sources of minerals and amino acids found in a plant source. Their dense amounts of nutrients are thought to help produce energy, enhance the immune system, and darken coat color and skin pigment. Seaweeds are also rich in iodine and support the endocrine glands (thyroid functioning).

Do make sure if you are feeding these types of sea vegetables to your dogs, that you grind them or pulverize them first, as they make a ‘gel’ that can result in a blockage in the intestines of our canine friends if it is fed whole or in strips.