Valentía imperecedera

A token that's a copy of Enduring Courage won't return to the battlefield when its last ability resolves.

Dog and Glimmer are both creature types. Enduring Courage won't have those creature types when its last ability returns it to the battlefield because it won't be a creature.

If a nontoken permanent that's a copy of Enduring Courage dies while it's a creature, it will return to the battlefield as an enchantment when its last ability resolves. It won't have any card types other than enchantment.