前两类机构提供的狗寿命可能更长，因为犬舍俱乐部的成员和买了宠物保险的主人可能会花更多钱来延长爱犬寿命。
The first two may be biased toward longer-living dogs, because owners who belong to clubs and buy insurance may spend more to prolong their pets' lives.
上述两类训练者共同的问题是他们的训练会让狗儿不喜欢，或不尊重主人。
The problem with both categories of dog trainers is that their training produces inconsistent results along with dogs that don't like or respect their owners.
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