Have you tried simply setting "defaultexpanded" to "[] in your initialization code:
Code:
ddaccordion.init({
headerclass: "mypets", //Shared CSS class name of headers group
contentclass: "thepet", //Shared CSS class name of contents group
revealtype: "mouseover", //Reveal content when user clicks or onmouseover the header? Valid value: "click", "clickgo", or "mouseover"
mouseoverdelay: 200, //if revealtype="mouseover", set delay in milliseconds before header expands onMouseover
collapseprev: true, //Collapse previous content (so only one open at any time)? true/false
defaultexpanded: [], //index of content(s) open by default [index1, index2, etc]. [] denotes no content.
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