Odin is having his first proper summer shed (since last spring he was still tiny baby) and the hair under his joints and in his tail area gets *incredibly* matted and tangled *incredibly* quickly. So, add "brave enough to poke around the genital area of a dog bigger than you are with sewing scissors" to your "am I ready to raise a newfie?" checklist
(He was very well-behaved and patient about it, all things considered. But if I fucked up and jabbed him with the scissors, it would be quite foreseeable that the two-meter long dog might panic and injure me)