I think Luxray and its basic/secondary form are based on lions.
Similarly though, the tiger doesn't really have a blatant Pokemon counterpart? Growlithe and Arcanine's markings resemble that of a tiger, but they're obviously dogs. Raikou, sabre-toothed tiger, sure - but still seems a tad obscure. hmm, how about meerkats?
And they don't do many lizard-esque Pokemon; what about a ground-type monitor lizard? That'd be wicked.
And yarr, canine Pokemon have been done to death - but what about an arctic fox ice-type? d'aww!