Sure, Mink, Martens, wolverines. and otters
Ferrets would need webbed feet to become semi-aquatic like the mink
Ferrets do not kill cats, in fact cats are usually scared of ferrets.
Ferrets are members of the Mustela genus. There are 17 species classed as Mustela including weasels, stoats, polecats, mink and ferrets.
Ferrets have been mated with mink, wild European polecats (ferrets) and ermine, and have been surrogates for black footed ferrets, and are related to otters, but I don't think that mating with an otter would be successful.
They are mustelids, along with badgers, martens, otters, weasels, ferrets, mink, fisher, and the wolverine.
No. The wolverine is a member of the Mustelid group, along with otters, ferrets, weasels, mink.
Mink IntelligenceLike their cousins, the otters, mink are very playful. They are very inquisitive, highly intelligent animals. A study was performed that compared the learning ability of mink to ferrets, skunks, and house cats. The animals were tested on their ability to remember different shapes. The order of ability of remembering these different shapes were from best to worst; mink, ferrets, skunks and cats. Mink were in fact found to be more intelligent than certain groups of primates. After considerable training, mink were also found to learn after only one trial. This is a phenomenon usually only observed in higher primates Source: wikipedia
Close relatives found here, but no ferrets. Residents are the mink, long tailed weasel, least weasel, river otter.
Kill it
Canine distemper is 100% fatal, but can be avoided with a vaccination. Any untreated illness can kill ferrets.
Three found there are the least weasel, long tailed weasel, and the mink.