My name is Dipper!

We adopted "Dipper" from Craigslist 3 years ago and believe he was abused.
He is a good, loveable boy who listens well and understands basic commands such as sit, come. Paw and when told to "go to your room". He reluctantly goes to his crate.
We have 2 other boys but he doesn't get along well with them and attempts to be dominant.
At my age, He has become too much for me to handle.
Please assist in rehoming.