One TikTok user has come up with a brilliant new nickname for elderly dogs and it’s gone viral across the app. Watching your furry friend grow old is never easy, but the funny trend is bringing humor to one of life’s saddest moments. TikTok’s new name for old dogsPeople on TikTok are calling their elderly pooches ‘Fossil Dogs’ after one viral video which has had more than 12 million views. In the clip, a pet owner wrote: “When your 18-year-old fossil dog takes a wrong turn and ends up in your room.” She then filmed her old pooch, who looked really confused, and added a viral sound that says: “…