Character (dog) transform from baby to adult over time?

[Quetzalcodename]

Hey @Rogeralvca! Welcome to the Forums!

To add on, you can is another thread where a user figured out how to update the reference pose for their skeleton:

Update skeleton rest pose of one instance of skeletal mesh

I even tested it in Unreal 4.24 and it was still stretched, so I just made a new animgraph with a single anim node that simply set each bone to what I had recorded for a given pose and that works great. It is sad that SetRefPoseOverride does not work and no one from Epic responded to my question: Calling SkeletalMeshComponent SetRefPoseOverride on identical instance of a skeletal mesh produces stretched and incorrect bind pose on target - Character & Animation - Epic Developer Community Forums

As well as a Live training from Unreal that goes over character morph targets being implemented in engine:

Getting Started with Character Morph Targets | Live Training | Unreal Engine

I hope the above solutions are what you need to solve your problem!