A Brand New War — Richard Alan Dickson

Bert sneaks away from the team to slip deep into the heart of Growler the Mutt's empire. He chases rumors of a repair part for their ship, but Pinky fears a trap. She and the others race to follow Bert into enemy territory to warn him of the danger, but there may be more to the trap than the cats know, and no way to keep its deadly jaws from snapping shut.

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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!