Yes, it absolutely is.

When that rule begins to apply is a factor of:
Metering method, and which priority settings are in use,
The camera and its ISO capabilities / noise properties,
How far one pushes those capabilities,
Exposure differences between subject and background (and even different parts of the subject).

+1/3 can be over exposed depending on several things.
Dalmatians blow out -really- quick, while Westies give a bit more latitude because of the difference in fur textures.


For this particular shot, you must take into consideration:

1. Center weighted exposure at a very close distance. The Center weighted area is on dark fur so the exposure is already pretty high relative to other parts of the frame including the white on the dogs nose.

2. The white is important in this case. At a greater distance (out in the middle of the ring for example) I might even go +2/3 or even a whole stop for this dog because blowing out the white on the face wouldn't be as noticeable. However, when it is this large in the frame, and "in your face" the details need to be retained. As shown, there are parts on the snoot that are pushing 230 in two channels.