What's the Kennection? #205

What disease, named for the rough red rash it produces, may have caused Helen Keller's blindness and deafness?

What Walt Disney title character is a cocker spaniel who gets outwitted by two conniving cats named Si and Am?

According to navy legend, who saved Stephen Decatur's life in 1804 by bravely stepping in front of a pirate's sword?

What name did B. B. King famously give to all his black Gibson guitars?

The title character of what Dostoyevsky novel is Alexei Ivanovich, who, like the author himself, is addicted to roulette?

What's the "Kennection"?