Stimpy has been with me for a long time. He's 12 years old and has always been grumpy, even as a kitten. We joke that he was destined to be an only child but never was. Stimpy had never really been around dogs when we adopted Dexter so they took a while to warm up to each other. I do catch them being nice to each other every once in a while though so there is hope. Stimpy wasn't thrilled when Jack came home with us from the hospital either. He likes a quiet house and Jack is definitely not quiet. He normally keeps his distance which is why you don't see him in many pictures but every once in a while he'll get brave and walk next to him.
And then Jack gets to give him some loving.
Stimpy wasn't really a fan of Jack's loving. He spent the next hour grooming himself and dodging Dexter.