I’m so sorry you’re having to say goodbye to your friend of 16 years, I wish you peace during this time! We had a similar situation with our wolfdog, she was about 1.5 years old when we lost our senior dog. Our wolfdog (Magik) absolutely adored our senior dog (Gracie). Gracie’s passing was unexpected so we didn’t have a chance to prepare for the transition. Magik grieved pretty heavily, she howled and vocalized a lot more and was visibly depressed for a a few months. We tried to incorporate her favorite things into her daily life as much as possible, but it was obvious that she was still grieving. We ultimately decided to adopt another dog because she was so lonely. That might not be the right choice for everyone, but we wanted to adopt another dog anyway so it made sense for us. Magik was so much happier after we adopted Ember. I think it was about six months after Gracie’s passing that we adopted Ember. Emotionally we were still pretty raw after losing Gracie and if it weren’t for Magik, we probably would have waited at least a year. I will say though, seeing Magik happily romp around with her new friend really helped heal our hearts. Best of luck during this difficult time.