Skin problems are very common in dogs and cats, and have a vast range of underlying causes. Often a diagnosis is determined by physical examination , but further testing such as blood work, urinalysis, skin scraping, or biopsy, may be necessary. It is important to contact us if you notice your dog or cat scratching excessively, or if he or she develops any bare patches, scabs, scaling, redness, inflammation, lumps, or bumps. Some skin diseases such as mange and ringworm are zoonotic (can be spread to humans), so early diagnosis and treatment is important.