Skulls, Skeletons, Canines & Claws

[Panthera]

This unknown canine fossil from North-east China(upper left canine?). It's length is 112 mm totally, and the crown length is 40mm(inside) and 45mm(outside).

According to the size, and it has vertical groove(bleeding groove), so it is big cat, right? tiger? But after I read this section, I find Amur tiger's canine crown can reach 70mm, or maybe it is younger or female individual....; If this canine belong to leopard or jaguar, it's size seems slightly larger, but this is not necessarily.....   

I think because it is a fossil, we can’t only just look at it from current animal distribution perspective, but also should from the past. 
In the prehistory, It is very likely there were tiger(Amur tiger), leopard(here exist the largest subspecies, Amur leopard), jaguar(prehistoric jaguar may be slightly larger than the current size in America), cave lion, lynx, even the brown bear in there
(I also doubt it is bear canine because it's shape and the radian of crown, but this fossil has a unique trait of big cat, vertical groove).

Any ideas what it is?

PS. In my opinion, I think it is most likely to be a tiger or a bear, but I do not know how to distinguish the canine of both.

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*This image is copyright of its original author

*This image is copyright of its original author

*This image is copyright of its original author

*This image is copyright of its original author

*This image is copyright of its original author

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