Lack of motivation/commitment?
There's nothing wrong with not having any experience, this isn't for everyone. Caring for a companion is a major commitment and often includes significant changes to a person's life that many aren't willing to make. Doesn't make them lazy or selfish, just not ready to commit to such.
It's not the kind of thing a person should just dive into, a dog requires a commitment of about 15 years, some of those years are going to suck really bad and horses take an even greater commitment.
For those who know for certan this is for them and there's nothing else they want more, they tend to do whatever it takes to provide for a companion.