The Halti Comfy Harness is exactly what it says it is. A comfortable harness which is suitable for walking your dog daily. Easy to fit and adjustable, it is made from premium quality nylon and is fleeced line, ensuring maximum comfort, even on long walks! Featuring 3M reflective strips, your dog will sure to be seen in all conditions! Size Guide – Chest Measurements:XX Small 48cm/18. 9 55cm/ 21. 7 Jack Russell, Shih Tzu. Small 58cm/22. 8 70cm/27. 6 Beagle, Springer Spaniel. Medium 64cm/25. 2 80cm/31. 5 Collie, Brittany Spaniel. Large70cm/27. 6 90cm/35. 4 Labrador, Pointer.