This is going to sound really silly I fear.
He's eating fine. He's drinking fine. He still loves walks. He's just so well behaved now. It's not right.
During the day he sleeps by my feet (except when we're out walking of course. On an evening when I am out he sleeps on the top of the stairs on his own and comes down to sit with me when I get in. There is no somersault filled greeting. He just quietly pops himself on my lap.
He still chases seagulls in the yard.
He just seems quieter. He's even stopped dry humping things.
We were told he was between 18 months old and 2 when we got him, which means he's now 4 - 4.5. Is it normal for them to slow down so much at that age? Could he be older?