When in heat, female dogs exhibit behavioral and physical changes such as restlessness, increased urination, swelling of the vulva, and a greater interest in male dogs.
The first signs of a dog going into heat include swelling of the vulva, increased urination, and behavioral changes such as restlessness or flirtatious behavior.
Because dogs live shorter lives and perceive time differently, an hour may feel significantly longer to them—possibly equivalent to several hours for a human.
Dogs recognize human faces using a combination of visual cues, scent, and voice, showing a preference for familiar people and paying close attention to emotions.