Finnish fellow I hunt moose with has a young Karelian bitch. She was working a cow and calf for 30 min or so near me last autumn. She really stuck at it and eventually a young cow came across in front of me and I shot her just before she disappeared, having decided she was a heifer. Very happy dog and dog handler soon followed. Really nice, very stable dog!
We tracked the cow and calf later, they passed through a dip about 150m from me and I never saw them