Causes
Dogs: allergies, foreign bodies (grass awns), infections, moisture. Rabbits: hard or wire-mesh surfaces, being overweight, poor hygiene, unsuitable flooring.
Diagnosis
Examination of the feet. The vet looks for foreign bodies, performs cytology and assesses the underlying cause.
Treatment
Treat the cause: remove foreign bodies, treat the infection or allergy. In rabbits: switch to soft, absorbent flooring, manage the weight, apply local wound care.
Prevention
Rabbits: soft flooring (NEVER wire mesh), good hygiene, a healthy weight. Dogs: check the feet after walks and dry them well.

