United Schutzhund Clubs of America
Whether you are looking for supplies for your pet/companion or a competition partner
there are many vendors of training equipment, trial necessities, health supplements, treats, crates, collars,  
leashes, and so forth....here are some that might interest you in your search.
This is not an endorsement~only links for your viewing.
WUSV - Weltunion für Schäferhunde Vereine