A 9-year-old 27-kg (59-lb) neutered male Dalmatian was evaluated because of non-weight-bearing lameness and swelling of the proximal portion of the right pelvic limb of 2 weeks' duration. The dog had had a similar episode 6 weeks previously, which had resolved over a period of 2 weeks when treated with an NSAID and cold-packing of the limb.
Clinical and Gross Findings
The caudal aspect of the right thigh was swollen and firm; palpation elicited signs of pain. Serum biochemical analyses revealed high alkaline phosphatase activity (304 U/L; reference range, 20 to 157 U/L). Ultrasonography of the right pelvic limb