What's

[james_davis_nicoll]

white furred, sinuous, and definitely not a cat or rabbit and lives in Kitchener? Whatever it was, I saw one this afternoon.

Comments

[jesuswasbatman]

Albino weasel of some kind?

[gingicat]

Stoat?

[boxofdelights]

Someone has lost a ferret.

[bibliofile]

All of the above (in winter fur).

[gale_storm]

Lemur? They are extraordiarily sinuous and do come in white coats, although that's more of a spring/summer weardrobe for them! :-D

[batwrangler.livejournal.com]

Stoat?

[jhetley.livejournal.com]

Ermine?

[jessie-c.livejournal.com]

Did it look like this (https://upload.wikimedia.org/wikipedia/commons/a/a9/Mustela_erminea_winter_cropped.jpg)?

Wikipedia says that's a Stoat in winter fur, when it's known as an Ermine (https://en.wikipedia.org/wiki/Stoat).

[w. dow rieder (from livejournal.com)]

Some types of weasel have a white coat in winter.

[malnpudl.livejournal.com]

Albino skunk?

[bruce munro (from livejournal.com)]

Did it have a bathing-machine?

[heron61.livejournal.com]

A skinny possum?

[affreca.livejournal.com]

Escaped lab rat?

[rozasharn.livejournal.com]

There is also the possibility of an albino squirrel.

[lostwanderfound.livejournal.com]

Luck dragon.

[murasaki-1966.livejournal.com]

Riki Tiki Tava's albino cousin

[spiralsheep.livejournal.com]

A snark? Beware though, it might be a boojum!

[timgueguen.livejournal.com]

Ferret would seem to be an obvious guess.

[keithmm.livejournal.com]

Snowsnake.

(Old Canadian Military College joke.)

[leecetheartist.livejournal.com]

Iceweasel?

It doesn't have to be an albino to be white. It could be a white morph (has pigment that happens to be white) rather than albino (no pigment).

Red eyes = albino

Normal eyes = white morph

Someone is doing some research on white squirrels if you've seen one.
http://www.untamedscience.com/biodiversity/white-squirrel/