What do I search to get a lego cow????
I have tried cow, moo, farm cow, dairy cow, cattle, etc.,
Please help!

It is maybe because there aren't any on Mecabricks... for animals you shall generally look into the "Animals" category and if you don't find it has probably not been yet modeled.

Rats! I guess I'll have to make that barn a housing for farm equipment, eh.

https://www.mecabricks.com/en/forum/topic/50/87

You can post all the missing bricks you need here.