Here are some benefits of kelp for dogs and cats

Great Pet Care: Kelp is recommended for its dental benefits as it helps decrease the amount of tartar and calculus that forms on the teeth for both dogs and cats. It contains Ascophyllan nodosum variety, which is beneficial for oral health.
Source: Great Pet Care

Canine Journal: Kelp is a nutritious food source containing 21 amino acids, 60 different vitamins and minerals, high fiber, and antioxidants. It acts as a prebiotic to promote digestion, control negative gut bacteria, and support overall health. Additionally, kelp is low in calories and fat but high in protein.
Source: Canine Journal

K9sOverCoffee: Kelp offers various health benefits for dogs, including supporting a healthy thyroid, reducing skin allergies and itching, minimizing shedding, aiding digestion, reducing joint inflammation and arthritis pain, and repelling fleas. It is available in powder form and easy to incorporate into a pet's diet.
Source: K9sOverCoffee

Raised Right: Kelp is rich in protein, fiber, iodine, calcium, and antioxidants, which support muscle development, healthy digestion, immunity, bone development, and blood circulation in dogs. These nutrients contribute to overall well-being and health.
Source: Raised Right

These sources highlight the various benefits of incorporating kelp into the diet of dogs and cats, emphasizing its nutritional value and positive effects on their health.