None of the animals listed deserve their own awesome week of Discovery goodness, but there are several who do. Bears should get their own week as should dogs and cats (two separate weeks). It would also be cool to see a week devoted to the weirdest deep sea creatures.
As for what they'd be about, the bear one would be all about how much ass bears kick (so much). The dogs' week would probably focus on the evolution of the free roaming canines of the past into my retarded retriever. The cat week would focus on big cats and their massive badassness with a couple short specials on domestication, preferably set in Egypt. The deep-sea week would just be an alien freak show with immortal jellyfish, 200 dB shrimp clicking, various fish that look like they came straight out of your nightmares and even the giant squid.