Herriot was worried about Tricki because he was in bad shape and very unhealthy. He was expecting the call from Mrs. Pumphrey because he knew the dog would become sick soon due to his over-eating habit. The expected call was the complaint that Tricki didn't eat anything and was vomiting, and panting.

Introduction:
In the book "All Creatures Great and Small" by James Herriot, Mr. Herriot expresses his concern for Tricki, a Pekingese dog, in one of the chapters.

Tricki's Situation:
Tricki was a pampered dog who had become overweight due to overfeeding by his owners. His owners, the Lunds, were wealthy and could afford to feed Tricki rich foods such as cream cakes and sausages. However, Tricki's weight gain had started to cause health problems, and Mr. Herriot had been called in to examine him.

Mr. Herriot's Concern:
Mr. Herriot was concerned for Tricki this time because the dog's health had deteriorated significantly. Tricki was now suffering from a variety of health problems, including difficulty breathing, a lack of energy, and a reluctance to move around. Mr. Herriot knew that Tricki's condition was serious and required immediate attention if the dog was to recover.

Tricki's Treatment:
Mr. Herriot decided to admit Tricki to his veterinary clinic to monitor his condition and provide him with the necessary treatment. He put Tricki on a strict diet and exercise regime to help him lose weight and improve his health. Mr. Herriot also prescribed medication to help with Tricki's breathing and other health issues.

Conclusion:
Overall, Mr. Herriot's concern for Tricki was justified, given the severity of the dog's health problems. Through his expertise and care, Mr. Herriot was able to help Tricki recover and return to a healthier state.

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