Figure 1. Left hind limb.

History/Signalment:

A 6-year-old castrated male German Shepherd dog had a two-week history of a swollen, erythematous tract on the left hind limb with marked crusting. Initial treatment with amoxicillin and prednisone resulted in noticeable improvement. However, a draining tract developed in affected areas and progressed to episodes of profuse hemorrhage. The patient was sedated for punch biopsies and placement of a probe for the draining tract. Surgical excision of the draining tract was performed, with no significant findings.

Figure 2. Left hind limb.

Figure 3.  Left hind limb, haired skin. H&E, 1x magnification.

Figure 4. Left hind limb, haired skin. H&E, 1x magnification.

Figure 5. Left hind limb, subcutis. H&E, 6x magnification.

Figure 6. Left hind limb, deep dermis and subcutis. H&E, 4x magnification.

Figure 7. Left hind limb, deep dermis. H&E, 6x magnification.