Hi Lena,
You probably don't know me very well but my name is Chelsea and I have dealt with tons of loses. And if you want my personal advice from my experience with loses a loved one or a loved pet the best advice is to think of the good times you had with your dog and how happy he/she made you feel. That is what I did when I was sad about my dad. I just thought of the good times we had together.
And your dog was probably either ready to die or was very old because everything in life has a reason. Everything. So there must be a reason for your dogs death too. I know you said that your dog died 97 days ago and you are feeling all of the sudden very very sad about losing him/her. That is perfectly normal!!
Sometimes sadness from losing someone or something you loved can take a long time to even feel any emotion. Like for example, when my dad died my mom was not sad until five and a half months later. The first two months of him being gone when I was nine were really hard. My mom was not there for me. She was just locked in her room.
But what I am trying to say is, sadness can take a long time to creep up on you. So if your feeling sad about your dog right now, it means that your emotions and love for your dog are entering your brain right now. It is perfectly normal and healthy to cry or feel mad at someone even. But just remember you always have your kt family and me!!!
I made you smile!!
I see it!!
I'm always here. 
-Chelsea
