You can put hats on 'em. Hope this helps

The otter can be very useful for gathering fish meat — it will harvest fish on demand. You can also use it to forage for Silica Pearls, and it will occasionally find Black Pearls.

It increases your insulation. With fur armor and a otter. The winter mountain won't kill you anymore

Increasing melee damage increases the hypothermic and hyperthermic insulations on the carrier.

I once had an otter that I named harry otter , he was a great otter he got me all the silica and black pearls I needed, he once saved me from a megalodon , he kept me warm to, he was a great companion I took him almost everywhere,but one day I was farming pearls with him I threw him at a fish to get pearls from it but instead he disappeared I looked and looked for him only to not find him but uneven got a message that he was dead, he's still out there somewhere, I still look for him to this day. #prayforharryotter