Several male collies were used to play Lassie in both film and TV (even when Lassie had puppies). They were larger, had longer fur, and didn’t go into heat.
I think I got the joke. $15 in the late 19th century would be worth about $600 today when adjusted for inflation. With a family’s monthly groceries costing in this range, my local supermarket’s cashier hardly blinks at approving $600.
My guess is that this scene is set in the 19th century (suggested by the TV western-style garb), when $15.00 was considered a lot of money. The joke is that the teller needs approval for an amount that seems trivial by today’s standards.
Several male collies were used to play Lassie in both film and TV (even when Lassie had puppies). They were larger, had longer fur, and didn’t go into heat.