My Sweet Molly, Already 7 Months Gone

Hello everyone, I'm Fabienne from Belgium and sadly I had to let my sweet Molly go last November due to cancer. We had tried chemo for 4,5 months but all of a sudden it took a turn for the worse and she just stopped producing white bloodcells.
I'm still completely heart broken about it and have been searching for kindred spirits and someone to talk to.
It is very sad that here in Belgium it is not done to grieve for a pet, you can't even grieve for a person for more then a few weeks...
I sought help at my doctor, but he just waved my sorrows away saying 'it was just a dog'.
I then tried to turn to a psychiatrist but there was also not realy much understanding for my grief (and it costs up to 75 EUR per session..)
There are no support groups here so I had no other option then to turn to you.
And I'm thankfull that this exists, altough it's on the other side of the world (thank God for the internet)
I miss my girl, she was always with me, I work from home so my babies are actualy seldom alone.
They are my family, friend, compagnons, my everything.
I got a new puppy after a few weeks and I love her to pieces.
She's also a very sweet baby but people always think that, when you get another dog, there is definatly no more reason to grieve the old one.
Why are people so rude and have no feelings?
I'm not used to this way of communicating so I'll leave it for now and hopefully there are some of you who respond.
Thank you for taking the time to read this.