mainly because he’s not an actual therapist, just a horse therapist

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He’s not even that, he’s a therapy horse.

Basically, it’s to be willing to really look at yourself and identify and acknowledge what makes you unhappy, find what makes you happy, live for yourself, don’t be the reason you aren’t happy.

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Obviously the man was rich and had the means to retire to a yurt and live peacefully and not everyone can do something so drastic, but you can still look inward and really reflect on what makes you happy and strive for it.

Symbolically Bojack looked up to Secretariat far more than his own father. There’s probably a lot of layered symbolism in having Arnett voicing him in Butterscotch’s voice, as well (beyond the practical reason of not getting the original va). Also, as far as I remember, they labeled Secretariat as his father for the scene, further emphasizing Bojack’s desire to have Secretariat as a proxy for his father.