McGrowl, a bionic super dog, tries to decide if his new neighbors are really as friendly as they appear to be or if they are hatching a sinister plan.

Thomas and McGrowl have some interesting new neighbors. Cheerful Hiram Biddle and his young niece, Binky, have set up an obedience school for dogs. Soon, all the neighborhood pups and pooches, including Thomas's own dynamic doggy, are attending. But then Thomas and McGrowl's partner-in-adventure, Violet, becomes best buds with Binky-and Thomas feels really left out. When Thomas starts to suspect that Binky may not be as friendly as she appears, is he just jealous--or might he be on to a sinister plan? This tail-wagging thriller will have you guessing until the end!

Thomas and Violet suspect evil Milton Smudge of stealing one of McGrowl and Miss Pooch's new puppies.

After the local newspaper features a story about McGrowl's heroism, the golden retriever and his pal Thomas are invited to visit McGrowl's former owner, Edwina Tuttle, but find themselves on a wild goose chase masterminded by the evil Milton Smudge.

Thomas's class is taking a weekend nature trip to Devil's Island, and his bionic best friend is coming along for the fun. But danger is in the air. Legend has it there's a secret volcano on the island. Could someone be plotting to activate it and destroy Thomas's nearby hometown.

When Alvin Wiggins meets sweet and shaggy McGrowl, he is sure he has found the pet of his dreams, but after a freak accident and a creepy encounter with the veterinarian Dr. Minderbinder, McGrowl is changed forever. Original.