The ONLY time I saw my dad cry was when Tiny, our beagle / terrier mix who we'd had for something like 14 years, died. She had curled up under a tree in the yard and ... well... when dad drove in the drive, she didn't move.
Dad KNEW (we all did). I watched him go over to Tiny - he was shaking - and he tried to wake her up by talking to her.
Oddly, when I offered to bury her, Dad said "No. I have to do this".
And he did.
That was in 1974 or 75 or 76 ... I remember it like yesterday.