[NAGDU] Where to find Bells for Dog Collars?

[Janice Toothman]

Good Morning Everyone.

I have received my Second guide Dog from Guide Dog Foundation.  He is a 
White Standard Poodle, almost two years old and 24 inches tall.

As a Deaf-Blind person, I want to keep track of him in the house once I 
take him off leash eventually, once he is acclimated to the home.

Does anyone have any recommendations of loud bells, where to get them, 
that are not too big and how you would put them on the collar.  Thanks 
in advance