ASTORIA, Ore. — A few weeks ago, shortly before 11 p.m., Patti Brockhoff’s 3-year-old pug, Babette, started behaving oddly, as if she were having a prolonged seizure, so she called her regular veterinarian. But her vet wasn’t on call that night, and the on-call vet couldn’t be reached, either. Brockhoff, of Astoria, finally called Tanasbourne Veterinary Emergency in Beaverton.