mastiff-dog-breed-store.com offers Professional Dog Training Bag for training your Mastiff
Quick Access Dog Training Treat Pouch/Bag made of high quality material !
Approximate dimensions:
5 1/5 inch (13cm) high, 
5 1/4 inch (13.5cm) long,
3 inch (7.5cm) deep (open).
Use the same training bag(pouch), that world Champions do.

  Quick Access Dog Training Treat Pouch/Bag for Mastiff
Description of the dog training treat bag:
Large pocket stays open for easy access to dog food, dog treats, small training toys, holding tracking articles or tracking bait.
Close quickly by tapping with elbow, and firmly closes with Velcro.
Enjoy the material of the treat pouch: It's water-resistant, sturdy, and resists stains and tears.
The belt of the dog treat bag is securely stitched and adjustable.
Belt adjust easily and has quick release to easily open or close on your waist.
You can adjust the belt to the following range - 29 1/5'' - 52 '' (73-130cm)

  Quick Access Dog Training Treat Pouch/Bag for Mastiff
  Key futures of the dog training treat pouch:
- Pocket stays open for easy access to food, treats or dog toys.
- The Belt is full adjustable.
- Tear resistant material
- Stain resistant material
- Water resistant lining!
- Pocket can be closed by Velcro!!!
Intended use of the dog training treat pouch:
- Obedience training
- Everyday walking your Mastiff for occasional training
- Spoiling your dog or dogs from time to time anywhere
General "Woof" Tip: Using right  material for padding is crucial for your dogs comfort – good padding   should be of natural origin to avoid rubbing and irritation of your  dogs skin and fur.  Please be very careful when you select  padded dog product, check how padding attached to the chest plate or  other padded areas.Glued padding is not the best way to make good  padded harness, muzzle or collar, stitching might be much better idea,  hand stitched products will cost more, however this is the best way to  make product which serves for lifetime.