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Your dog? It has to be an animal that frequents your home / an urban area with floorboards like that. I'll guess your dog's an Olde English Sheep dog with the clue being not a sheep.

is it cat fur?
or dog hair?
I guess that's dog hair, is it my guess right? :)
@ash

@zool237 Good answer !

My Golden sheds one of those every 3.7 minutes this time of year

 7 years ago (edited) 

anggora cat

I think it's dog hair

going with dog also, we have a Great Pyrenees that sheds similar looking furballs lol

Looks like Donald Trump's hair when the coloring wears off

Goose down? It's definitely tangled, but I've seen dogs and cats with a mess of fur like this.

dog