Our 1/2 Rat Terrier 1/2 Jack Russel Terrier age 9 months began submissive behavior 3 weeks ago with whining, belly crawling and urination whenever family came into the room. Her condition worsened suddenly, with neuro symptoms of staggering and neck torticullis. She progressively worsened, eventually not eating or drinking. Temperature was 104 - neuro worsened with each day. Blood work was normal, xrays appeared normal, no trauma known. IV hydration was initiated and over a week of no eating or drinking continued. Eventually, a barium GI test was performed due to gas noted on followup xrays. Remarkable recovery the next day with lessened neuro and return of appetite - continuing to improve with some minor neuro "shaking" and symptoms - we are pleased with results but more than somewhat puzzled with etiology - any ideas?
Also - if you can identify the cause(s) - is relapse likely or should we be looking for anything else to do - she is eating voraciously, manner has improved (minor whining with minimal submission postures) - we are hopeful, but puzzled.

Optional Information:
Age: <1; Female; Breed: Jack Russel/Rat Terrier

Already Tried:
see question