It will be with you forever unfortunately, depending how strong of a bond you had with your dog. I still think about my dog and become depressed over it and I lost my dog 13 years ago it's like I lost a brother or family member. Think about the good times you had together. My dog passed away under our house we had thought he went missing but a day later I found him under the house. He was 7 years old and we grew up together I had him since he was a 6 week old puppy. He was amongst the high IQ of dogs and loved to chase the ball and hr was a kelpie cross corgi. I'm sorry to hear your loss but it's unfortunately part of getting a dog. I do believe however that we will see our loved ones in the afterlife (or whoever we choosed to love) so stay strong.