Meaning of dog-in-the-manger attitude

Answer 1

A dog-in-the-manger attitude is a person who selfishly keeps something not needed or wanted so that others may not enjoy it.

Answer 2

A "dog-in-the-manger" attitude refers to someone who selfishly prevents others from enjoying or using something that they themselves have no use for or interest in. This metaphor originates from the fable where a dog, though not eating the hay in the manger, prevents the cow from eating it as well.