Small :

• around the chest behind the front legs (red color on the picture): 62-77 cm.
• around the neck of the dog (green color on the picture): 44-64cm.
• chest strap (blue color on the picture): 60 cm.

Medium:

• around the chest behind the front legs (red color on the picture): 77-90 cm.
• around the neck of the dog (green color on the picture): 66-86 cm.
• chest strap (blue color on the picture): 67 cm.

Large:

• around the chest behind the front legs (red color on the picture): 80-120 cm.
• around the neck of the dog (green color on the picture): 71-89 cm.
• chest strap (blue color on the picture): 73 cm.

Extra Large:

• around the chest behind the front legs (red color on the picture): 99-130 cm.
• around the neck of the dog (green color on the picture): 68-90 cm.
• chest strap (blue color on the picture): 77 cm.