There are 2 books in the Dipple series. The newest book is Night of Masks which came out in 1969.

1
Catseye

Book cover of Catseye
The "imaginative . . . intriguing" far-future novel about the telepathic bond of friendship between human and animal-from the New York Times bestselling author (Booklist).

Exiled after his home planet was turned into a military outpost following an interstellar war, Troy Horan is relocated to the planet of Korwar. Under…
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2
Night of Masks

Night of Masks
The story concerns Nik Kolherne, who aids in a kidnapping to win a new face to replace his scarred one. He gets his new face and fights to free the kidnapped boy -- and himself -- from the Thieves Guild. - The action ends with a rousing battle on a…