Lost my dog of 15 years

Today I just lost my dog (labrador)who's been with me since i were a kid , last night he came back from his usual walk and started acting weird took him to the vet and he was in a critical state and today at around 8 am he left this world in my mother's arm , now I'm just going insane thinking about him but pretending to be strong so it doesn't affect my mother she has completely lost her appetite and have been grieving. Please hug your pets and give them extra treats.