Sometimes I think about killing my pet. Do I have some deep underlining issues?

Not sure why but sometimes I've had images pop into my head about different ways of killing my pet. I've always had violent thoughts about hurting others since childhood, but I've kept them supressed because I know I'll be sad if I carry them out. Normally when I write down how I want to hurt or kill someone the thoughts go away.
Sometimes I think about killing my pet. Do I have some deep underlining issues?
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