"What are you doing, Freddie?" asked Bert Bobbsey, leaning over to oil the front wheel of his bicycle, while he glanced at his little brother, who was tying strings about the neck of a large, handsome dog. "Making a harness," answered Freddie, not taking time to look up. "A harness?" repeated Bert, with a little laugh. "How can you make a harness out of bits of string?" "I'm going to have straps, too," went on Freddie, keeping busily on with his work. "Flossie has gone in after them. It's going to be a fine, strong harness." "Do you mean you are going to harness up Snap?" asked Bert, and he stood his bicycle against the side of the house, and came over to where Freddie sat near the big dog. "Yes. Snap is going to be my horse," explained Freddie. "I'm going to hitch him to my express wagon, and Flossie and I are going to have a ride."