do you gotta feed em
You need find wild brahmin on ecounter and have rope. And use rope on brahmin.
Not WILD, they attack. You want just Brahmin.
Falloutdude your first post disappoints me some. The heavy sigh, you do realize there is nothing in game that tells people how they might get a brahmin in the wastes. In fact there is very little instruction in this game for new players. Now that is NOT your fault, but it's an example of how 1) This game has become soo much less usable for newer players. and 2) How the player base has become less tolerant of new players, and the changes that might be needed in game to assist them.
The wiki says +1 then half the number of dogs you could have (40 Party Points Each). So with a base cha of 5 and a speech of 50% you should be able to own two, but I haven't tried this. One cow has always been enough for me.