Question Anyone Retargeted Quadruped/Animal skeleton animation to another one?

Hey there! Just wondering..

1-Has anyone retargeted/remapped a Quadruped (or more/octoped (spider))/animal skeleton rig - to another Different Sized/Proportion rig?

2-If not (this way) but still could, did you have to 'match' the size of both skeletons to retarget for animation to be transferred correctly?

3-Does anyone know of tools/assets that can transfer animation of a quadruped (not biped/humanoid; but quadruped)/animal of 4 legs or more; to another 4-legged animal; that may have a different skeleton proportion/size?...or you know of tools that can do it automatically or manually - if they match perfectly in size/proportion (bone to bone same size/transform/rotation etc...)? So far I think that 'different sized quadruped skeletons animation' autoretargetting tools just.. don't exist? It seems it's Only bidep/humanoid on 2 legs stuff?

Thank you in all cases!