畅快

好久没有放松到哼曲儿了，真是放了个大松

In a study published in Animal Cognition in 2013, nine dogs were observed to see if they could pick out the face of another dog — regardless of breed — on a computer screen instead of another animal or a person. The dogs were rewarded with treats with a successful choice. Though the sample size was small, it indicated dogs can recognize other dogs on a screen.

If your dog used to get excited by another dog on television but has since lost interest, it's possible they simply became desensitized to their appearance, realizing the image in front of them isn't going to move out of the boundaries of the monitor.