I too have a black pug, and they seem to be practically nothing but idiosyncrasies.
They have a lot of personality and he’s also pretty clever at times. Clever enough to ‘forget’ commands when it suits him, but instantly recognize the words ‘car ride’, ‘treat’, ‘cookie’ or his dog friends’ names, even when used in casual conversation. There’s a huge difference in response to:
“Hey Bruce, you want to go outside?” (Response: casual enthusiasm)
“Hey Bruce, you want to go for a car ride?” (Response: extreme enthusiasm)
“Hey Bruce, you want to go see <another dog’s name>?” (Response: insanity)
I also trained him to scratch at the door when he wants out. He seemed to leap to his own conclusion that scratching on things makes things happen. He only does this if I’m not in view, so he’ll just leave the room and go scratch the fridge or something. So, I’ve learned to ask him when he scratches: Bruce, do you want to go out? Bruce, do you need water? and just run down the list. Answers, crudely translated:
No: <silence> <eventual resumption of scratching>
Yes: collar goes jingle jingle jingle Expectant pug arrives at my side.
Usually a fridge scratch means “food”, which is funny because I never fed him out of the fridge, he somehow just got the suggestion. Because he’ll ask for food a lot of times, I’ll say “No you don’t need any food.” Then I hear a lot of puffing and scratching and things moving in the kitchen and confusedly investigate, only to find:
Pug, sitting angelically in the center of the kitchen.
Giant auto-water-dispenser, empty, moved into center of room next to pug.
Pug: <expectant look>
He also likes to get involved with TV shows that involve dogs or horses and barks or howls at them excitedly. If I tell him to be quiet, he gets quiet for a bit, but you can tell he really wants to bark. So when the urge becomes overwhelming he watches the TV and goes, barely audibly, woof. < pause> woof. If I scold him again, he’ll take it down to a barely noticeable huffing exhale noise through his nose. Hnff. Hnff.
Interestingly he responds even with the audio off or with only audio playing at all, but only to dogs (or wolves) and horses - not to cats, people, or other things. It’s weird.