The utility model relates to an adjustable animal collar, which is composed of a fan-shaped main body formed by concentric circles, and two sides of the main body are respectively formed by a pair of corresponding joint members to form a conical cylinder to cover the neck of the animal. It is used to prevent biting on other parts of the body； it is characterized in that: a plurality of concentric arcs are arranged on the main body to form a broken line which is easy to tear, which can be adapted to tear off the main inner ring at the inner ring to adapt to the broken line. The neck circumference of the animal can also be broken away from the dotted line at the near outer ring of the main body to adapt to the head length of the animal.一種可調式動物頸圈，由同心圓所構成扇狀一主體所構成，主體之兩側端分別藉由一對相對應之接合構件以組成環繞相接成圓錐筒狀，以套於動物之頸處用來防止對其身上其它部位之舔咬；其特徵在於：在主體上連續設有數圈同心弧狀設置易撕裂之斷離虛線，可因應撕離主體近內圈處斷離虛線以適應動物之頸圍，亦可因應撕離主體近外圈處斷離虛線以適應動物之頭長。
