Well, the Torah does show some kind of negative attitude in Hilchos Mechir Kelev. It doesn’t mean we hate the species. We can even love it, but we know that it is especially Tamei. The same goes for the Davar Achar. We have nothing personal against it, but we know that it represents Tuma — with no fault of its own. Rav Pam once said that it is not the pig’s fault that Hashem made it a pig.
Turtles can be very good. Dogs have a hard time with that sometimes, but it’s true. And dogs can be good, too – when they give turtles piggy-back rides. (It’s not the piggy-back’s fault that Hashem made it a piggy-back.)