I have an 8 month old retriever, Minni. Her eyes look bloodshot. They don't seem to be bothering her, never rubbing them or anything (can dogs do that??).
There are some conditions of the eye which can cause irritation (and pain, if you've ever experienced an eye problem before - Mother Nature intends it that way since the eyes are so precious and deserving of attention). If it continues, a veterinary exam is probably in order.