Why did I find hair on my signed hoodie???

So…I got the signed hoodie for a late Christmas present. It hadn’t been opened, I sort of held onto it during presents. Later when I took a look at it, I found multiple different strands of hair on it, I know that dogs have been in the back of my car…but my dogs aren’t BLONDE. Uhh……someone care to explain? It could’ve been me, (I’m a brunette though) and I noticed of course, the leftover hairs that are usually on hoodie after being made, but I don’t think some are blonde….😂