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Following are health screenings often performed on breeding Chihuahua adults; choosing a puppy from a breeder who tests parents for health can help avoid future health problems in your puppy:
CERF Screening (Canine Eye Research Foundation)
Patellar Luxation Test - OFA
Pyruvate Kinase Deficiency (genetic test)
WARNING - TEACUP: There is no breed standard defining "teacup," "toy," "pocket-sized," etc. All Chihuahuas are in the Toy group and are held against the same standard. Use of these descriptive terms can be misleading, and may indicate the intentional breeding toward abnormally small size, which can produce health issues.