| Observational category | Description |
| Approaching | Dog opens mouth widely and exhales |
| Tail wagging | Dog licks its mouth or nose |
| Panting | Dog pants with open mouth |
| Scratching | Dog scratches its body |
| Stretching | Dog stretches its forelegs or hind legs |
| Yawning | Dog opens mouth widely and exhales |
| Sniffing | Dog sniffs the air or the experimental materials |
| Grooming | Dog grooms its body with its tongue |
| Shaking | Dog shakes its body |
| Refusing | Dog tries to get away from the experimental area |
| Jumping | Dog jumps up into the air |
| Freezing | Dog maintains the same posture over 3s |
| Others | Barking, whining, excretion, etc. |