He was a serial killer — of dachshunds.

A state court judge yesterday found Dudley Ramsey, 25, of Brooklyn, guilty of aggravated animal cruelty in the fatal beating of his 5 -pound puppy, Junior, in 2006.

A second dachshund, Viola, was found buried in the Ramsey’s backyard. Her skull had been crushed, but Dudley was charged only in Junior’s death. Both dogs were less than a year old when they were killed.

Ramsey could get up to two years in prison at his May 7 sentencing.