St. Bernard does something strange when he's exhausted

After a long walk, Sully is exhausted and often manifests this by pushing an imaging object with his two front paws. Can anyone explain this behavior?
After a long walk, Sully is exhausted and often manifests this by pushing an imaging object with his two front paws. Can anyone explain this behavior?
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DETAILS

Credit:
Editorial #:
1257050848
Collection:
Rumble
Date created:
July 03, 2018
Upload date:
License type:
Rights-ready
Release info:
Not released. More information
Clip length:
00:00:48:10
Location:
United States
Mastered to:
MPEG-4 8-bit H.264 HD 1280x720 24p
Source:
Rumble Editorial
Object name:
5460541.mp4