Hard rubber and fur are commonly used in demonstrations. 在演示中，常用硬橡膠棒和毛皮。
Puppies need to experience many different sensations and textures in their mouths so rope toys and hard rubber toys are usually a hit. 小狗需要對不同的東西進(jìn)行感受，所以一些繩索類(lèi)和硬橡膠類(lèi)的玩具會(huì )對小狗造成傷害。
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