Snap, as I have told you, used to belong to a circus before the Bobbseys bought him, so perhaps learning tricks came easier to him than to most dogs.

"Yes, I taught him this trick myself," went on Nan. "He will walk around on his hind legs, and carry a doll in his front paws, just like a nurse girl. When I dress him up in one of my old skirts and a jacket, he is too funny for anything! I'll make him do the trick now, only I won't dress him up, for I can't find the clothes he wears. I don't believe we brought them. But I'll make him carry the doll for you. Here, Snap!" called Nan.

The dog, who had been sleeping in a sunny Spot on deck, near Snoop, the black cat, sprang up, when he heard his name called.

"Where are you going to get a doll for him to carry?" asked Dorothy.

"I'll take Flossie's. You'll let sister take your doll to make Snap do a trick, won't you, dear?" she asked.

"Yes, Nan," answered flaxen-haired Flossie. "I just love to see Snap do that trick! He carries the doll so cute!"

Flossie brought her doll to Nan, and Snap stood near, wagging his tail, for he seemed to know what was coming.

"Now, Snap," said Nan, pointing her finger at the dog, "I want you to show Dorothy how you play nurse-girl, and carry a doll."

"Bow wow!" barked Snap. That was what he always said when any one spoke to him. I suppose HE knew what he meant, but no one else did. At any rate, he seemed to understand what was said to him.

"Up, Snap! Up!" called Nan suddenly, and Snap rose on his hind legs, holding his fore paws out in front of him, so Nan could place the doll on them.

This the little girl did, putting Flossie's "sawdust baby" carefully across Snap's paws.

"Now take the doll for a walk!" ordered Nan, and, with another bark, off Snap started, parading across the deck.

"Oh, isn't he too cute!" cried Dorothy, laughing and clapping her hands. "Oh, what a smart dog he is!"

"Isn't he!" agreed Nan. "Bert said I never could teach him to do a trick, but I did."

"Indeed you did!" agreed Dorothy.

"Now come back here, Snap!" ordered Nan. But just then something happened.

How it was no one knew exactly, but Bert suddenly caught a fish. He was so surprised at getting a hard bite on his line, that he jerked it up quickly. Something flashed in the sunlight, and, the next moment, a little sunfish landed flapping on the deck, right in front of the sleeping black cat Snoop.

"Flop!" went the fish, and Snoop awakened with a jump. Up to her feet she leaped like a flash, and then she saw the fish. Snoop was very fond of fish, and made a spring for the one Bert had caught. But the fish was wet and slippery, and no sooner had Snoop pounced on it with her claws than the fish slid across the deck of the houseboat. Snoop slid after it, just as she often slid across the kitchen oilcloth, when she sprang for a piece of string that Flossie or Freddie would pull along to make the cat play.

Right across the deck, after the slippery fish slid Snoop, and, the next instant, the poor cat had slid right off the deck, and fallen into the lake with a splash!

CHAPTER X

DOWN THE CREEK

"There goes Snoop!"

"Oh, somebody get her!"

Nan and Dorothy both shouted at the same time. As for Bert, he was so surprised at having caught a fish, and at seeing the cat slide off the deck with it, that he could say nothing. It was almost the same with Harry. He had jumped to his feet, however, and had run toward Snoop, but too late.

Then, all of a sudden, Snap, with a loud bark, gave one spring, and the next moment he had jumped right over the deck railing, under which Snoop had slid. Right over it went Snap, and down into the lake. For he knew that Snoop had fallen in, and, being the kind of a dog that asks nothing better than to save something, or somebody, from the water, Snap was right on hand.

"Oh, my doll! My doll!" cried Flossie. "Snap is taking my doll into the lake with him! Come back, Snap! Come back!"

Snap did not stop to listen. He had, indeed, taken Flossie's doll with him. He had been holding it on his front paws as Snoop slid overboard, and, as he gave a jump, Snap did not come down on all four legs. He jumped while he was yet standing on his hind ones, and of course the doll went over the rail with him.

"What has happened?" cried Mrs. Bobbsey, as she heard the screaming, and the splashes in the water. "Have any of the children fallen in?"

For she had gone to another part of the deck, with Dinah, out of sight of the twins for a moment. Now she came hurrying back, and a single look showed her that the children were all safe.

"What has happened?" she asked again.

"As nearly as I can figure out," said Mr. Bobbsey, "Bert caught a fish, Snoop tried to get it and fell into the water, and now Snap has gone in after Snoop."

"And Snap has my doll! She'll get all wet--she'll be drowned!" cried Flossie.

"I'll get her for you," offered Harry. But just now they were all anxious to see what Snap and Snoop did. Mr. and Mrs. Bobbsey and the children looked over the side of the houseboat. They saw the black cat swimming about in the lake, and Snap, who was a fine water-dog, was paddling toward her.

"Hadn't you better stop the boat?" asked Mrs. Bobbsey, for the Bluebird was slowly floating away from the dog and the cat.

"Yes, I guess it would be best," said Mr. Bobbsey. So he called out:

"Captain! Captain White! Stop the boat! Something overboard!"

Down in the little motor room Mr. White heard the shout, and he at once shut off the gasoline engine. Then he came up on deck as fast as his lame leg would let him, to see what was wrong.

"What's that you say?" he asked. "Somebody fell overboard?"

"The dog and the cat," explained Mr. Bobbsey. "I wonder how we can get them out? It's Snoop and Snap who are in the water."

"And my doll!" added Flossie. "I want my doll back!"

"Oh, yes, and Flossie's doll," added Mr. Bobbsey. "I guess you'd better get in the rowboat, Captain White. It will be easier to lift them out from there."

"I'll do it, Mr. Bobbsey," the captain said, as he limped down stairs again. By this time Snap had swum to where poor Snoop was paddling about in the water. The dog gently took hold of the cat by the back of the neck, where her loose fur would give a good hold. Then Snap, holding Snoop's head well up out of the water, started back for the houseboat.

"Good old Snap!" called Mr. Bobbsey. Snap wanted to bark and wag his tail, as he always did when any one spoke pleasantly to him, but he knew if he opened his mouth to bark now, he would have to drop Snoop.

And Snap had hard enough work swimming, without trying to wag his tail. On he came toward the boat.

By this time Captain White had gotten into the small boat, which was pulled after the Bluebird, by a rope, and he was rowing toward the dog. Seeing that the smaller boat was nearer, Snap swam toward that, instead of toward the larger one. He held Snoop carefully up out of the water.

"That's a good dog, Snap!" called Captain White, as Snap came nearer.

"I'll take her now."

The engineer lifted poor, wet, dripping Snoop into his boat. She crawled close up to Captain White, for she was much frightened. After Snap had delivered the cat he had rescued, he turned back again.

"Where are you going?" asked Captain White. "Don't you want to get in my boat, too, Snap?"

"Bow wow!" barked Snap. This time he could open his mouth, as he was not carrying a cat.