What is the term for a young male dog?

The term for a young male dog is not best described as "intact," which generally refers to an animal that has not been neutered or spayed and thus retains its reproductive capabilities. In the context of dogs, typical terminology for a young male dog is "puppy," which is not one of the available choices.

The correct term that is often used in the context of animal science and dog breeding is simply "puppy," while "intact" is more of a descriptor of the animal's reproductive state rather than its age or gender. The other choices also do not apply to dogs: "colt" refers to a young male horse, "gilt" refers to a young female pig, and "filly" refers to a young female horse. Each of these terms indicates a specific animal and does not relate to dogs, further highlighting that "intact" is not appropriate as a term for a young male dog.