It might be a random passer - by in the area around Snape's residence. The dog could have been protecting its territory and lashed out, and Harry, being the helpful character he is, takes on the task of cleaning the bite.
Perhaps it's one of the Hogwarts students. The dog might have been provoked by the student's actions, and Snape is too embarrassed or proud to clean the bite himself, so Harry is made to do it.
Chapter 316, "Blood Jade Fox and Mischief, Xia City in Turmoil, Migration Begins", is the clearest early answer because it pushes Xia Hong into a new phase or setting. The chapter gives readers a real answer by opening on This breathing sound is just like what we heard at the first silver... and ending on The Cold Blood is a horizontal blade, so Xia Hong often uses it for....
Chapter 331, "Zhu Shun and Huang Tianxi, the 3rd Year Cold Yuan Banquet of Great Xia, and Xia Yuzong (Part 5)", is the clearest early answer because it turns Li Tiancheng's situation into a concrete plot event. The chapter gives readers a real answer by opening on The children immediately lowered their heads in fear, Huang Tianxi... and ending on The Seven Departments in the Outer City East, South, West, and North....
Chapter 69, "Received Two Advertisements on the First Day", is the clearest early answer because it turns Director Sun's situation into a concrete plot event. The chapter turns that into something concrete by moving from Since the phones issued by the program team couldn't log into Weibo,...
Chapter 311, "Expulsion and Unease, an Overzealous Xia Chuan (2)", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. The setup is Xia Hong's eldest daughter, Xia Ning, couldn't help but speak:..., but the pressure keeps building through I heard that last night, Uncle Yue and the others were seriously....
Chapter 51, "The Great Lodging Competition", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event.
Chapter 300, "Perseverance, Beast Tide Breaks the Barrier (Part 2)", is the clearest early answer because it turns Longyou Army's situation into a concrete plot event. The chapter gives readers a real answer by opening on Everyone heard the words, including Yuan Cheng, and immediately... and ending on Indeed, this bull-headed persistence doesn't seem like Li Xuanling's....
Chapter 123, "Can This Even Be Calculated?!", is the clearest early answer because it turns Seeing Jiang Li's situation into a concrete plot event. It opens with After He Yun also carefully rolled up her trouser legs and walked...
Chapter 343, "Five Rounds of Bone Tempering, One Thousand Bristles Bone Burning in the Visible Yang Realm", is the clearest early answer because Star finally turns buildup into a real advancement. The chapter turns that into something concrete by moving from Hong Ye and the Zhao family members happened to be walking below the... to Thus, he didn't rush the breakthrough but boldly attempted a second....
Chapter 343, "Five Rounds of Bone Tempering, One Thousand Bristles Bone Burning in the Visible Yang Realm", is the clearest early answer because Bone Tempering finally turns buildup into a real advancement. Early on, Hong Ye and the Zhao family members happened to be walking below the.... By the end, Thus, he didn't rush the breakthrough but boldly attempted a second....
Chapter 310, "The Leader Is Still the Best, The Consequences of Losing the Bet", is the clearest early answer because it turns Long Mountain's situation into a concrete plot event. A useful checkpoint is the way the scene starts with You should be very clear about the consequence of losing a gamble,... and follows through with Who would've expected, last night at the Wushuang Tunnel entrance,....