The guard on the bridge would foil that quest.

He would not permit a forlorn little yellow dog to seek happiness by following members of an officer's family across the Government bridge.
Probably in the name of law and order he would kick him, as the other man had done; the dog's bleared little eyes, eyes through which the love longing must look, would cast one last look after the unattainable, and then, another hope gone, another promise unrealized, he would return miserably back to his loveless world, but always-- "Watts," said Katie sharply, "stop a moment, please.

I want to get something." Ann was sitting very straight, looking with great absorption up the river when Katie got back in the carriage with her dog.

Her face was pale, and, it seemed to Katie, hard.

She moved as far away from the dog as she could--her mouth set.
He sat just where Katie put him on the floor, trembling, and looking up at her with those asking eyes.
When they were almost home Ann spoke.