My name is Snicker Doodle!

Snicker Doodle came from a hoarding situation. We adopted him and another cat at the same time. We had no issues for at least 1 years+. Issues began to arise with Snicker Doodle and our orange tabby, who is very docile. Snicker Doodle would stalk him and attack. He would not allow the orange tabby to use the litter box. Fast forward to now and it's been almost 5 years since we adopted him. He continues to have the issues above and also sprays despite being neutered. We have tried feliway, prozac, kenneling him at night, etc but the issues persist. He would do fantastic in a single pet household. He just feels the need to constantly dominate and mark his territory if there is threat of another pet. We have a daughter and he has not shown aggression towards her, but we also don't let her close enough to find out. He's a loveable cat and is great with adult humans. If we take him back to the shelter we got him from, they will euthanize him. I'm looking for a kind soul to take in my boy.