I have three favorite animals,: pandas, penguins, and Shiba Inus.

I like pandas because its color is onlytheir only colors are black and white, so I think the design is cool and cute.

Penguins are also cute because they have similar coloring as pandas, and t. ¶
Their walking style looks a little stupid, but I love it.

Finally, Shiba Inu is theare my most favorite animals.

Actually, I kept the doghad (such a dog)/(a Shiba Inu) before I came to university.

"Keeping" an animal is less used for pets and more for livestock animals (keeping chickens, for example).

His name iwas Ponta, which I namedchose because he looksed like a raccoon dog aswhen he iwas a puppy.

I changed to past tense to match the sentence above where you said "had a dog before university".

One of the biggest fascinations about Shiba Inu isWith Shiba Inu, I am most fascinated by their taleils.

This sounds a little more natural.

Shiba's tale is like a donut but every dog has a different cute taleAlthough every dog breed has a unique, cute tail, Shibas' tails are like donuts.

Again, the emphasis seemed more natural to me if it was re-arranged like this. Also, note the apostrophe comes after the 's' for plural possesives. I switched it to plural since you are discussing Shiba Inu tails in general, instead of the specific tail of your Shiba Inu (I think this is what you meant).