If they pretend to be happy to see us, we’ll scratch behind their ears and let them forget about the nightmare they live at all times, and secretly they hunger for our blood. But if they slake their thirst and eat our livers, there will be no one to give them scritches.
So they play along despite their ancient hatred and maybe, just maybe, we’ll give them that hard rub on the spot just above the tail. Yah, that one. Oh, god, keep doing that. Yah, do it, you sonofabitch, or I’ll rip your throat out in your sleep tonight because you’re no use to me anymore.
It may seem as if we cannot know, but if we want to evaluate this then we see something different.
Dogs are mammals, just like us. Their brain structures are sufficiently similar to understand its mechanisms, such as its structures and electrical flows, the secretion of hormones related to pleasure, connection, stress, or panic.
If dogs were constantly itchy, we would’ve known ever since we started analyzing brains in terms of their structure, their function, and their interactions with bodies.
So no, dogs aren’t constantly itchy.