如何训练宠物狗狗定点大小便

{!-- PGC_VIDEO:{\"thumb_height\": 288, \"vname\": \"\u7231\u72ac\u5927\u5c0f\u4fbf\u8bad\u7ec3.mp4\", \"neardup_id\": 12037929368620906095, \"thumb_width\": 384, \"vu\": \"5210f0560244457984c5901469eb2c89\", \"src_thumb_uri\": \"1203000c2e1d566691bd\", \"sp\": \"toutiao\", \"update_thumb_type\": \"1\", \"vposter\": \"http://p0.pstatp.com/origin/120100027288ece4679f\", \"vid\": \"5210f0560244457984c5901469eb2c89\", \"video_size\": {\"normal\": {\"h\": 288, \"subjective_score\": 4, \"w\": 384, \"file_size\": 8793051}}, \"duration\": 155, \"thumb_url\": \"120100027288ece4679f\", \"md5\": \"7b3d98d97b8f366ca64fc27e93cb3cd7\", \"hash_id\": 12037929368620906095} --}如何训练爱犬在指定位置大小便，这里给出一个常用的训练方法。