; (B) hearing dogs for those who have lost their hearing later in life by alerting to alarms, door bells, sirens, and more; (C) service dogs for those with other physical disabilities that are specially trained to provide balance, retrieve dropped items, open and close doors, turn on and off lights, carry a backpack, and more; (D) facility dogs that are specially trained to spend time working with wounded veterans recovering at military hospitals and veterans medical centers; (E) dogs that work with physical and occupational therapists as they treat soldiers and become an essential part of the healing process; and (F) posttraumatic stress disorder service dogs that are trained to help mitigate the symptoms of posttraumatic stress disorder by providing the emotional and physical support a veteran may need. 3. Coin specifications (a) Denominations In commemoration of the invaluable service that working dogs provide to society, the Secretary of the Treasury (hereafter referred to in this Act as the Secretary ) shall mint and issue the following coins: (1) $5 gold coins Not more than 50,000 $5 coins, which shall— (A) weigh 8.359 grams; (B) have a diameter of 0.850 inches; and (C) contain 90 percent gold. (2) $1 silver coins Not more than 500,000 $1 coins, which shall— (A) weigh 26.73 grams; (B) have a diameter of 1.500 inches; and (C) contain not less than 90 percent silver. (3) Half-dollar clad coins Not more than 750,000 half-dollar coins which shall— (A) weigh 11.34 grams; (B) have a diameter of 1.205 inches