Taking a one-year-old for his physical check-up is not usually that difficult – unless, of course, he happens to be a 450-pound grizzly cub. Last week, Northwest Trek veterinarian Dr. Allison Case had not one but two enormous grizzlies to examine – so naturally enough, she made a house call. On Thursday morning it was Hawthorne’s turn. Huckleberry had had his check-up on Wednesday, and all went well. Now, he was out in the bears’ forested habitat, intently chewing an elk hide treat, while Hawthorne lay peacefully on a cot bed in their sleeping area, anesthetized for the exam. “We’re …