You need to trim the hairs that grow between the pads on the feet, the sooner you do it the better as it will get the pup used to it as it is something that needs doing regulary. The pup needs to walk on the pads not hair and the hair will just keep growing and can mat. You just need a basic sharp scissors and trim the hair where it protrudes from between the pads, don't go down between them you can tidy up the hair growing past the nails too, Yuki will soon get used to it , the younger you start the better. HTH