Just tie round dogs neck. 

Quantities in a pack
X15 S-XL x5 S x5M x3L x2XL
X30 S-XL x10 S x10 M x5 L x5 XL
X65 S-XL x23 S x22 M x10 L x10 XL
X100 S-XL x35 S x35 M