And dependiNg on growth stage if short in neck temporarily layback of shoulders could improve in future and that would "lower" measurement. That Happened to my boy around 6 months when he regrew a neck. You completely describe his awkward uneven growth stages! Is your dog small boned? Losing the knuckled knees? Those are other indicators. My guy would have big growth spurts and the plateau so he would be up and down on percentiles at that age. This one has grown 5/16 inch ( a little over 1/4 inch) between 6 and 7 1/2 months and lost knuckly knees by five or so months. But he could still surprise me later sith a big spurt. He was projected that nnot be over 14 and is 14 exactly and small boned.