I have an almost 3 year old male- he does NOT mark- he uses wee wee pads and goes outside but I got him at 6 months old and neutered him a few weeks later. Males I think can be a bit harder to train but as long as you spend a lot of time with him he will be great!!! I will tell you that little boys love their mommys!!!! I guarantee you you will be happy you took both of them!!! Keep us posted !!!!!