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The narrator, a veterinary surgeon, is a wise, observant, and compassionate person. He is indeed tactful because he manages to help Tricki without directly confronting or offending Mrs. Pumphrey about her overindulgence. He is also full of common sense, understanding that Tricki's problem is not medical but rather due to overfeeding and lack of exercise, which he addresses effectively.

Yes, Tricki was extremely happy to go home, as he leaped into Mrs. Pumphrey's lap with great excitement. It is likely that Mrs. Pumphrey will soon revert to her old habits of overfeeding and pampering Tricki, causing him to become unhealthy again.

This story appears to be a mixture of both real-life episode and fiction. While the specific events and characters might be fictionalized for narrative purposes, the underlying themes of pet owners overfeeding their animals and the practical challenges faced by veterinarians are very realistic and based on common experiences.