Why is my dog's fur falling off?

This is something common that Dogs do. It's kind of the same reason that they chase their tail or bury bones in the yard. It's just kind of what they do. It's called "shedding". My dog, Riley actually is so annoying with his shedding I actually had to put him outside most of the day. I would recommend brushing him a lot everyday or whenever you can do prevent this "shedding". Hope that helps!