I have experienced this type of transition a number of times in my life, most recently when my old boy dies last fall and now I am have only the almost 3 year old. I can sympathize with you, and only tell you that it will get better with time. Really. It always has with me. Remember, Wilson misses your old dog, too, it’s hard on him as well. Just keep doing what you’re doing and you will get past this. I promise. This is the third time I’ve had to do this and I know it’s hard. Pats and loves to both of you from me and my young boy. <3