Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: Heart heavy for lost furry family members. Remembering Max and Ozzie. Forever friends as 🐶😇
This tweet contains emotions: 
sadness