English is not my native language and i dont live in an english speaking country.
Well i already knew approximately how much a dog would cost because i already had cats. but cost isn't the only important factor to me in fact the only more expensive breed that comes to my mind would be a poodle because of the regular hair cut. (if you choose to not do it yourself)
As for the breed i knew what i wanted to do with my dog so if i want to put effort into training i won't get a stubborn breed and so on. So basically yes i already had an idea. but of course when i was younger id look for the cutest looking breed and study all breeds in order to decide which was the cutest.
Second i tend to look at the whole picture and if there are too many details i connect them and order them in order to get the whole picture. i always thought that was typical for INTJs. An example of what happens pretty often: Today i cleaned the room and i put a glass of water on the windowsill, i went out of the room thinking about something else, came back, opened the window and by doing so i pushed the glass of the edge instead of recognizing it.
About the psychology part: Well id say that this personality typing thing is a part of psychology and i did research about various mental disorders so i already know some bits and its interesting enough to consider learning more about it.
So Js stick to every plan they have? even if better opportunities come up? If i plan on getting a certain dog breed and the shelter doesn't have it ill keep looking. but if i plan on getting a certain breed and someone tells me something bad about it which i haven't considered yet and offers me a better breed which matches me more ill make up my mind.
Ive heard that before but aren't INTPs geniuses? All about math and science? And detail orientated? Im not that smart. well i think if it wasn't so boring id understand it and like it but unfortunately its boring. I also only do things which benefit my life. its hard to find something that keeps me interested. When i find something cool i get obsessive but it doesn't last long.
I also need deadlines if i dont have a deadline i won't do it. But ill procrastinate until the very end.