person A: I was sad when my dog died
person B: I'm so sorry!  That can be a devastating time. I have been there before.  How long did you have your dog?
person A: I had him for 10 years. It's just so hard because he was my whole world
person B: I completely understand.  Something that helped me was to have pictures up and also have a little remembrance each year with some other family that loved him as much as I did.  Just take it a day at a time.