those are cool facts! i hope you get more!

Reptiles and fish swim side to side. Marine mammals like whales swim in an up and down motion, similar to how terrestial mammals run. It's part of how we know they evolved from land beasties. :B

There are certain dog breeds that have back dewclaws...

From what I've read, yes it's not uncommon, but it is a defect.

It is, but something to note. Much like how dewclaws on domestic dogs are usually removed....sort of a creepy thing to adapt from real life to anthros if you really think about it. Great Pyrenees often have double dewclaws!

DAAAAMMMN THOSE DOGS ARE BUFF. O_O

Also I hate seeing little puppys get their dewclaws clipped off... AND dobermans with cropped ears and tails. I think it's sad. :(

Double dewclaws on hind feet are actually part of the breed standard in Beaucerons and Great Pyrenees.

Back dewclaws in other breeds are a sign of inbreeding. I know one breed that naturally has dewclaws on their back feet.

Rabbits don't have pawpads and it bothers me SO MUCH when I see someone drawing rabbits with pawpads. Sigh.

REALLY? I thought bunnies feet were just really fuzzy and you couldn't see the pad(s).

Nope! They have no pawpads. They use their claws to assist them in walking. The rest of their feet are covered in a thick fur.

When a carnivore's mouth is closed, the bottom canines are in front of the top canines. People tend to make that mistake a lot when drawing smiles or snarls.

Non white rats can't have red eyes. I always see this mistake and it bugs me. I mean unless you are drawing come crazy colored rat than whatever goes, but for realistic rats this isn't true.
It also bugs me how people always lump rats and mice together. Yes they are similar, but they have a lot of different traits. Like rats are bigger, smarter, and more social than mice. This cracks me up in books when they make the rats bad and the mice good, because pet rats tend to be much sweeter than pet mice. Not that mice are bad, but rats are just more cuddly.

i have to agree. throughout highschool and for a while after, i had many rats, and most were sweet and friendly. gave mice a try.. NEVER AGEAN. i had almost no interest in them. x_X and they were scared of me, as opposed to rats, who almost always want to be held and cuddled and stuff.