It turns out the puppy does like dog biscuits after all!
Trouble is, she’ll only eat the cheapest, nastiest no name brand biscuits that I buy for the older dogs. They are apparently at their most flavoursome, also, when they’ve been stolen out of the older dog’s food bowls. I’ve tried to explain to her that this is a dangerous game, but she won’t listen. I guess if the older dogs decide they like the super expensive gourmet puppy biscuits then that’s just the circle of life.