The cushion was there
both times.

The first account

On Monday, a household member says a dog mounted a blue cushion after visitors arrived. They remember the doorbell and the cushion. They did not see what happened before the dog entered the room or how the event ended. "It was because of the visitors" sounds like an explanation, but it adds something the account cannot establish.

The second account

On Thursday, another household member personally sees the dog mount the same cushion. No visitor is recorded in that account. That does not prove visitors are irrelevant, the cushion is a cause or the dog felt the same way on both days. It is a different event with a different observer and different gaps.

Put the accounts beside each other

The ledger can preserve Monday as reported and Thursday as firsthand. It can leave Monday's ending unknown. It can keep the known dates separate from the time the notes were written. None of those improvements produces a cause score. Two written events are not a measured rate because the household did not record every hour or every event.

Bring a question rather than a theory

A veterinary conversation could begin with "we noticed this on two occasions, and we do not know whether it has changed." UC Davis recommends veterinary assessment of possible medical contributions and notes that a journal can help. The record is useful because it is accurate about its limits, not because it settles the answer.

No one needs to bring visitors back, offer the cushion or approach the dog to make the pattern clearer. If a change is concerning, seek veterinary advice without waiting for more entries.