How they can do Gen 5 right and an Eeveetastic idea.

[JrDude]

Though I know it doesn't make it a fact, it seems more official here.
http://bulbapedia.bulbagarden.net/wiki/Legendary_beasts

[Zero]

Raikou is a Sabre Tooth Tiger sir.
Entei looks like he could be a lion, but that might be wrong.
If you didn't know, the "official" name for these things are the legendary beasts

I've been calling them dogs since I was 9 years old and I'll probably continue to do so. While I can agree that Raikou has features of a sabre-tooth tiger(most notable of which are the obvious fangs), I have to disagree with Entei being a lion, it looks more like a dog to me. It doesn't look remotely like a lion to me, but again, it'd probably be better to just call them beasts.

If you go by the Bulbapedia site you linked to, and want to go by what they say, then it would be something like this:

Raikou - Tiger
Entei - Lion/Mastiff
Suicune - Wolf.

Not sure why any of this matters though.