My understanding is this is 100% true for dogs but not for cats, and the reason for the difference in level of obsession is unclear.

We’ve got a rescue dog like that, reflections off watches or whatever (including kitchen baking sheets). It genuinely distresses him. Dog was seven years old when we got him, probably no fixing it now, but we do try to mitigate things as best we can.

In his particular case, his hunting instinct doesn’t help, I’m sure. He’s a pit bull, but that speckled neck and feet tells me that there’s some Spaniel in there somewhere.