给出一篇英语短文，并要求助手将其中所有形容词替换成同义词，输出替换后的短文。
以下为示例文本，但你可以使用任何你喜欢的英文短文。
    "The big brown dog sat lazily in the sun, panting heavily. Its shiny coat glistened in the light while it surveyed its surroundings with alert brown eyes. Suddenly, it perked up, hearing a distant sound, and sprang to its feet, ready to investigate."
The large tawny pooch lounged leisurely in the sunshine, breathing heavily. Its lustrous fur gleamed in the light as it observed its environment with keen brown peepers. Abruptly, it became attentive, noticing a far-off noise, and jumped up, poised to explore.