Not as much as bananas, which are mostly sterile hybrids propagated by rhizomes. But avocados have definitely been selected to be much bigger, with a lot more pulp around the seed.
I’m afraid I don’t know much about how well different animals can handle them. It’s hard to find information about what animals disperse what fruit, in part because most fruit are very non-specific (in contrast to flowers which often have evolved for specific pollinators). The one more recent paper I’ve seen talking about dispersal by extinct animals was on a very different fruit, the bitter squashes of North America that people later bred into non-bitter varieties.
