Kurgo Core Cooling Vests For Dogs Size:M to help support its natural to help support its natural defences and maintain healthy skin Prodibio Chloral Reset Water Conditioner Aquariums is effective in both fresh and saltwater because they contain a water conditioner that quickly neutralizes chlorine and chloramines in regular tap water The Core Cooling Vest is the answer to wearing a fur coat you can never really take off SIZE CHART Size Neck (A) Chest (B) Back (C)* Small 16 in (41 cm) 19 27 in (48 69cm) 13 in (33 cm) Medium 19 in (48 cm) 26 35 in (66 89 cm) 20 in (50 cm) Large 23 in (58 cm) 30 39 in (76 99 cm) 23 in (58 cm) X Large 26 in (66 cm) 35 45 in (89 114 cm) 27 in (68