Traitor in the Mist — Richard Alan Dickson

Cat Patrol Delta must break into the dog fortress known as the Iceberg to free hundreds of catnapped Earth cats. With a traitor still in the rebel alliance, breaking into the fortress for a third time might be hard, but finding a way out with the others in tow might be impossible... especially since one of the Reaper's enforcer dogs has set a trap to capture the space cats.

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Cat Patrol Delta, Series Description:

For generations, the Canine Cartel and the Space Cat Alliance have warred across the galaxy. On a mission to investigate an enemy signal, Cat Patrol Delta crashes on the little-known planet Earth, damaging its ship in the process. Delta discovers a war between cats and dogs on Earth, too... and the cats are losing.

Stranded, Cat Patrol Delta offers to help with the war. Four space cats should be more than a match for the Earth dogs, but Delta soon learns that it isn't the only extraterrestrial combat unit on the planet. The Reaper and his Canine Cartel have landed troops on Earth, as well. It's Cat Patrol Delta to the rescue and doom to all the dogs!