My suggestion is to be able to give a more exact number of cookies so that you do not have to give the same number, for example:
If you have the cookie multiplier x50, you don't have to give exactly 50, and this can help not alter the statistics of how many cookies you give and receive.
Here is a small example:
I like the idea, as you say, it is an incentive to train / walk with the pets. Also and as a way to contribute to your idea, they could implement a system of "training", example: easy, medium or hard training.
I hope it is added, good luck! ?