u/OG_Dinomummy

So I’m sure most of us use Der Die Das incorrectly from time to time, my question is, if I were to say Die Hund (wrong) instead of Der Hund (correct) to a native German speaker, I assume the native speaker will obviously know what I mean right? I suppose what I’m asking is, how “severe” is it to use the wrong Der Die Das? Like is it a little mistake or severe? I assume it’s no big deal right? Like what are some groß (big) grammar mistakes, and what are some klein (small) grammar mistakes? What should I lookout for? Anywho, I appreciate any help or responses! Tschüss!