The best replacement for ermine is weasel.

The best alternatives to ermine are rated as following:
★★★★★  weasel
★★★★  mink
★★  short tailed weasel
★★  stoat
★  ferret
★  chinchilla
  least weasel
  short-tailed weasel

Your alternative for ermine is not listed? Suggest!
Speaking about ermine, one probably shouldn't forget about lady.

Other search terms related to ermine and their ratings are:
★★★★★ lady
You have in mind a companion for ermine and it is not yet here? Propose!



Google Trends

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ermine
weasel
mink