It's a common misconception that Marshall is afraid of heights; he's scared of flying. As said in 'Pups Save A Toof '(Season 1).
Cap'n Turbot's full name is Captain Horatio Turbot (Francois calls him this in several episodes, such as "Pups Save the Diving Bell").
Marshall is a Dalmatian, Rubble is an English Bulldog, Chase is a German Shepherd, Rocky is a mixed-breed dog, Zuma is a Chocolate Labrador Retriever, Skye and Coral are both Cockapoos, Everest is a Siberian Husky, Tracker is a Chihuahua, Tuck and Ella are both Golden Retrievers, Rex is a Bernese Mountain Dog, Liberty is a Dachshund, Al is a Basset Hound, Nano, Mini, and Tot are all Pomeranians, and Roxi is a Samoyed.
All of the major characters' names apply to their jobs. Ryder is the only one to ride his vehicle on every mission. Marshall, the fire dog, is named after a fire marshal; Rubble is a construction pup; Chase, the police dog's name, refers to a police chase. Rocky the recycling pup has a name starting with "R" because of the "Three R's" (reuse, reduce, recycle); Zuma the water rescue pup's name is derived from the filming location of "Baywatch" (Zuma Beach, California); Skye the pilot's name refers to the sky; Cap'n Turbot's surname (Turbot) is a type of fish. The ten recurring pups, Robo-Dog, Everest, Tracker, Rex, Liberty, Coral, Nano, Mini, and Tot, also have meaningful names; Robo-Dog's name refers to a robotic dog; Everest, the snow rescue pup, is named after the snowy Mt. Everest; Tracker, the jungle pup, can track down anything using his advanced hearing; Tuck and Ella's names start with the same letters as their mighty powers (Tuck becomes tiny and Ella becomes enormous); Rex, the dino rescue pup, is named after a Tyrannosaurus Rex; Liberty's name refers to freedom and the Statue of Liberty; Coral, the leader of the Mer-Pups, is named after the coral reef; Nano, Mini, and Tot, the Junior Patrollers, have names that refer to their small size. Al and Roxi, however, aren't indicative of anything.
The voice actors change even through English speaking countries, with versions for USA, Canada and the UK.