Haha... you see it as a dog, i see it as a cat although (i guess) most people will associate wagging tail with dog more but I can be sure cats wag their tail too.
When I joined this challenge in Dec, I found it counts only if you start on the first day but I continue as a warm up.
After finishing one month in Jan, I thought I won't continue but a "prize" came in Feb so I joined the fun.
Then now as I continue, I'm challenging myself to do this for a year and see if I can. :-)