They can be easily added or removed from the pockets when you need to gradually change the weight. Perfect to build all groups of muscles including chest, neck, and shoulders, as well as endurance. Made of double-ply top quality harness leather this collar trimmed with contrast color thick waxed thread, and riveted for extra strength. Please measure your dog carefully to insure this is the correct collar before placing the order. This collar will fit 24" - 30" neck, wide 2.The item "8 Lb Genuine Leather Weighted Training Dog Collar Fits 24-30 neck Rottweiler" is in sale since Thursday, August 02, 2012. This item is in the category "Pet Supplies\Dog Supplies\Collars". The seller is "dogs_my_love" and is located in Sunnyvale, California. This item can be shipped worldwide.