Unverified90% confidenceDecision RuleTime unknown

项圈佩戴后应保证能轻松塞入两指（约2cm）的间隙，过紧压迫气管、过松易脱逃或钩挂；幼犬/幼猫需每2-3周复查一次颈围，因生长期颈围变化快

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Unverified尺寸选择留2指原则：颈围测量后，成品项圈调节到能插入2根手指为宜；幼犬/幼猫处于生长期需预留至少3-5cm可调节量，避免半年内勒颈86% similar Unverified项圈尺寸要看颈围可调范围，成长期幼犬需预留调节空间，选颈围调节跨度大（如20-45cm）的款式，避免半年内因颈围增粗需重新购买81% similar

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