You are a mirror
You are like a mirror to your dog. If you cannot stand being away from your dog for a second, your dog will likely also feel the same way and suffers separation anxiety. If you are very emotional, your dog will likely be reactive, too. Training can only help so much. You need to change. Instead of being the mirror, you can be the role model. If your dog is very obsessive, you can act independent. If your dog is very reactive, you can be aloof and calm. You can let your dog see what he should be, so he will follow your example. This way, you can complement your dogs by leading your dogs with what he lacks so your dog can be whole under your guidance.