Case Facts for Case 2 Dog lame in right leg Signalment 3 year old, spayed female PomeranianÑsmall/young Present History fell off bed-limping with weight bearing right hind leg-injury not too bad still bearing clinically norm w/i 1 mo-recur 6mo later mild leg right rear lameness-recur antiinflamm trt given-did not respond-or did it maybe thatÕs what was causing intermittentÉ. dose? No significant effects were seen Lameness not progressing Past History Vax reg-prob not infectious b/c vax and localized 1 leg Htworm up to date-irrel Deworm 2 mo ago-irrel Occ allergies-seasonal Ðquestionable relevance All trt= benedryl-any effect? Last trt 1 wk ago--irrel IndoorÑdecrased likelihood of trauma 1 other dog get along Ðpotential injury during play what size is other dog? owner watches when play outsideÑhave time to roughhouse inside 1 can food/day--irrel Exam Grade 3/4 intermitt non wt bearing rt hind leg-pain Palp rt hind leg medial buttressing poss on stifle Cranial drawer was neg-no hip dysplasia Patellar easily luxated to medial side of trochlear groove when extended On Stifle flexion patella returns to trochlear groove No abnormalities in hip, long bones or other leg joints Dog weighs 11.6 lbÑnorm 3-7 lbs.-fatty Pain on left with cranial drawer test Tail jack indicated pain Pain response to spine=none Tartar build up moderateÑirrel-expected due to canned food Possible Hypotheses-localized to stifle 1-Trauma 2-Congenital/genetic 3-Autoimmune