在给定类中搜索div中元素的正确方法？

<div class="therarepets">
    <div class="rarepet">
        <span>OLD</span>
        <a href="/go.html?url=https://examplepetshop.com/abc">Buy it.</a>
    </div>
    <div class="rarepet">
        <span>NEW</span>
        <a href="/go.html?url=https://examplepetshop.com/def">Buy it.</a>
    </div>
 </div>

    <a href="/go.html?url=https://examplepetshop.com/vwx">OutsideLinkDontWant.</a>

<div class="thegoodpets">
    <div class="goodpet">
        <span>OLD</span>
        <a href="/go.html?url=https://examplepetshop.com/ghi">Buy it.</a>
    </div>
    <div class="goodpet">
        <span>NEW</span>
        <a href="/go.html?url=https://examplepetshop.com/jkl">Buy it.</a>
        <a href="/go.html?url=https://examplepetshop.com/stu">CanHaveMoreWantedLinks.</a>
    </div>
    <div class="goodpet">
        <span>NEW</span>
        <a href="/go.html?url=https://examplepetshop.com/mno">Buy it.</a>
        <a href="/go.html?url=https://otherpetshop.com/zzz">OuterLinkDontWant.</a>
    </div>
</div>

<div class="thebadpets">
    <div class="badpet">
        <span>NEW</span>
        <a href="/go.html?url=https://examplepetshop.com/pqr">Buy it.</a>
    </div>
</div>
<div class="therarepets">
    <div class="rarep