早期无明显症状
There are no obvious symptoms in the early stage
以上为机器翻译结果，长、整句建议使用 人工翻译 。
尽管只有少数的狗患扩张型心肌病(大约2%)，但是这个病恶化很快、无明显的早期症状、常常是致命的。
Although only a few dogs will get DCM (approximately 2 percent), the disease comes on devastatingly quickly, produces very few noticeable symptoms, and is most often fatal.
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