What brand of dry dog food is the best. I want my girls to get all the nutrition they need and I also want it to be something they will like?

My guinea pig, (who Is four years old), has a small lump on his back. I noticed it just now. I hold him everyday, he didn't have it yesterday. It isn't hard, it's sort of squishy and moveable. I am worried though.

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我的狗的爪子和腿上总是有这些微小（非常微小）的黑色虫子。他们让她的地方痒痒的。我不断地用镊子把虫子去掉，但她却得到了更多。我想知道这些错误是什么以及如何处理它？

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