R.W.
I also am a step Mom of a boy who has behavior issues due to his mom's lack of attention. One thing we did, kind of by accident, was get a dog that instantly became Connor's pet and best friend. She is a lab and very very good with him. They seem to understand one another. He loves on her and she loves him back unconditionally. She gave him something to be responsible for and that is something that kids who don’t get enough attention from their parent cling to, a responsibility that someone is not forcing them to take on but something that they can and want to do on their own. Another great thing was that she also became something that sincerely hurt his feelings when we took her away from him i.e. he didn't get to feed her or he didn't get to take her on a walk he had to stay home while dad took her. I have even gone as far as to take her bed out of his room and put it in mine when he was grounded. My last piece of advice is that I have found after raising two boys and two girls… boys need to feel the consequence of their bad choices and wrong actions IMMEDIATELY. Girls can talk about things, think things through and make good choices based on their emotions and feelings. They don’t want to disappoint their Mom for example so they choose to do it right. I have figured out that with boys, One Strike You’re Out, is the absolute best method of correction. They get it and understand it much better. I use to count to 3 with the girls and they always did what ever before three, the boys NEVER did it on one or two. They obeyed on 3 or more. It just doesn’t work with boys. So I don’t wait on my sons. I ask them to do something and if they choose not to then they immediately feel the consequences of their actions with out much or any conversation in between the disobedience and the punishment. I give them lots of love after but I just try to react immediately and it has made a HUGE difference in my boys.
Good luck
Step parenting is a gift from God and remember to always pray for strength and guidance!