Answers for "how to change bootstrap dropdown icon"

remove arrow dropdown bootstrap

Simply remove "dropdown-toggle" class from the element. The dropdown will still work if you have the data-toggle attribute as follows

<button role="button" type="button" class="btn" data-toggle="dropdown"> 
    Dropdown Without Arrow
</button>

select dropdown icon change

-webkit-appearance: none;
-moz-appearance: none;
appearance: none;
background: transparent url(http://cdn1.iconfinder.com/data/icons/cc_mono_icon_set/blacks/16x16/br_down.png) no-repeat 100% center;