Arcanine is a shisa, which is commonly depicted as a lion/dog fusion. However, Growlithe is clearly just a dog and the lion-like elements of Arcanine are toned down. It's thus safe to assume it's not a feline, but a canine. As in, you know, ArCANINE.
We didn't get a proper lion until Gen VI. Hopefully we get a proper tiger soon too.
>>27628571>Hyenas>caninesThey're more related to badgers, mongooses and ferrets anon.
Point still stands, tigers aren't the only predators with stripes.