Available in the following sizes: (See Size Chart attached) Measurements are of the product, your pets measurements need to fit inside these measurements. XS Neck 21-26cm Chest 36-44cm S Neck 28-30cm Chest 40-50cm M Neck 32-34cm Chest 46-64cm L Neck 37-39cm Chest 54-72cm XL Neck 42-44cm Chest 56-81cm