I'm sorry for your sadness about losing Buttons but, maybe it might be helpful to write all your memories of you & Buttons down in a journal. It could be a way of redirecting your grief to remembering all of your good times with Buttons and accepting his time to leave you.
From just the few things you've posted about your bicycle trips & blowing out candles...I've enjoyed reading those precious memories of yours & Buttons!
Each dog has a different personality & connection with it's owner so, it's understandable that what you had with Buttons will be different with what you have with Ziggy. Each of my
girls has a completely different personality. My first, Bella is like your Buttons an I know I, too will probably grieve much more when she leaves for somewhere over that
.
I'll keep you in my thoughts for your grief to heal and your heart to find comfort in all of your memories with Buttons!
Take care!