dewclaw

n.

（犬、牲畜等的）上爪，（鹿等的）假蹄；

Dewclaw amputation [Dogs].
On diseases of cow dewclaw
Growth and wear of dewclaw horn in cows
[Growth and detrition of the dewclaw horn in cows]
Linkage of the locus for canine dewclaw to chromosome 16.
The cheetah (Acinonyx jubatus) dewclaw: specialization overlooked
Arterio-venous fistulaton following dewclaw removal in a cat
Linkage analysis of canine dewclaw locus = 개의 덧발톱 좌위에 관한 연관 분석
Cosmetic or not? readers sound off about cropping, docking, and dewclaw removal.(Letter to the editor)
Hyperphalangism of an extremely well-developed first digit accompanied by an extra dewclaw in the hindpaws of a dog