For four-year-old Blakeley, it was a routine exam. But for the humans who care for her, it was a chance to share and pass on crucial veterinary knowledge and skills. The Northwest Trek river otter was scheduled for a regular triennial wellness check-up, and it was a great opportunity for lead veterinarian Dr. Allison Case and vet technician Sara Dunleavy to teach Brianna Smith, visiting vet tech student extern, some of the skills she’ll need in a career of caring for animals. And at the same time, it helped Case get a little closer to solving a mystery about Blakeley’s …