词源stalk+后缀ing，中文意思是v. 潜近（猎物或人）；（非法）跟踪；存心骚扰（或迫害）；（诗、文）（悄悄地或威风凛凛地）穿过；（骄傲地或生气地）阔步走；（不好的气氛）笼罩（stalk 的现在分词）n. 围捕；跟踪罪

If the dog's hackles are up, gives a low decibel growl, or engages in a predatory, stalking posture, then there is probably a danger in the environment.