Do Androids Dream of Electric Sheep is borderline unreadable, but then that describes virtually everything Phillip K Dick ever wrote. The twin subplots of Sheep are "is it ethical to murder androids that imitate humans so well" for Deckerd and "can androids have a religion" for the androids that ties together in Mercerism, which basically becomes nihilism, which is the basic message of everything PKD ever wrote. The "Blade Runner" aspect of Sheep is reflected in a minor character Deckerd meets at the fake police station who is a cop that is also a replicant that doesn't know he's a replicant. Peebles, Fancher et. al. correctly surmised that this angle is far more human and relatable than the original Deckerd and his wife Iran, who eventually settle quite happily with yet another fake barnyard animal.
Deckard goes to an uninhabited, obliterated region of Oregon to reflect. He climbs a hill when he is hit by falling rocks and realizes this is an experience similar to Mercer's. Rushing back to his car, he stumbles abruptly upon a toad, an animal previously thought to be extinct, and one of the animals sacred to Mercer himself. With newfound joy, Deckard brings the toad home, where Iran quickly discovers that it is just a robot. While Deckard is unhappy, he decides that he at least prefers to know the truth: whether the toad is real or artificial, remarking with an exhausted reflection upon the events that have taken place that "The electrical things have their lives too, paltry as those lives are".
The book is a hard-core waste of time. I can't recommend it.