American Kennel Club (AKC)
The AKC standard describes the Maltese Lion Dog as a toy dog covered from head to foot with a mantle of long, silky, white hair. The dog should be gentle-mannered and affectionate, eager and sprightly in action, and despite his size, possessed of the vigor needed for a satisfactory companion. The head should be of medium length and in proportion to the size of the dog, with a skull slightly rounded on top and a moderate stop. Drop ears are set rather low and heavily feathered with long hair that hangs close to the head. Eyes are set not too far apart, very dark and round, with black rims enhancing the gentle yet alert expression. The muzzle is of medium length, fine and tapered but not snipy, with a black nose. The bite should be even, edge-to-edge or scissors. The neck should be sufficient in length to promote a high carriage of the head. The body is compact with the height from the withers to the ground equaling the length from the withers to the root of the tail. The topline is level, and the ribs are well sprung. The tail is a long-haired plume carried gracefully over the back. The coat is single, without undercoat, long, and silky in texture. Weight should be under 7 pounds, with 4 to 6 pounds preferred.
Fédération Cynologique Internationale (FCI)
The FCI standard classifies the Maltese Lion Dog in Group 9 (Companion and Toy Dogs), Section 1 (Bichons and related breeds). The general appearance should be of a small dog with an elongated, silky white coat, very elegant with a proud and distinguished head carriage. The head-skull length should equal slightly more than half the height at the withers, being fairly broad and slightly rounded. The stop is well defined at a 90-degree angle. The nose must be black, round, with open nostrils. The muzzle is straight with parallel sides, measured from the stop to the tip of nose, equals 4/11 of the total head length. The eyes are roundish, with a lively, alert expression, larger than normal, with perfectly fitting black eye rims. The ears are nearly triangular, set high above the zygomatic arch, pendant, and in close contact with the sides of the skull. The body trunk is 1/3 longer than the height at withers. The tail is thick at the root and fine at the tip, forming a single curve with the tip touching between the hip and the loin. Size for males is 8¼ to 10 inches (21-26 cm), and for females 7½ to 9 inches (20-25 cm). Weight should be 6-8 pounds (3-4 kg).
United Kennel Club (UKC)
The UKC standard emphasizes that the Maltese Lion Dog should be rectangular in proportion with a proud, elegant carriage. The breed should be intelligent, lively, and very affectionate while remaining a docile companion. The length of the head should equal slightly more than half the height at the withers, measuring fairly broad in width. The muzzle is straight and fine, measuring 4/11 of the total length of the head. The nose is black and round. The eyes are large, round, and dark with black eye rims. The ears are pendant, set on high, and heavily feathered. The body should be compact and balanced, with the height from withers to ground equaling the length from withers to base of tail. The topline is level with strong, taut loins slightly tucked up. The chest is deep, reaching below the elbow with moderately sprung ribs. The legs are straight and parallel with sturdy bone structure for the size. The coat is single (no undercoat), silky, straight, and flat, hanging long over the sides from a center part. The color is pure white, though ivory tinge or traces of orange are permitted but considered an imperfection. Height at withers for males is 8¼ to 10 inches, for females 7½ to 9 inches, weighing 6 to 8 pounds.
Other Organizations
The Kennel Club (UK) recognizes the Maltese Lion Dog with standards very similar to the FCI, emphasizing the breed's compact size, flowing white coat, and gentle temperament. The Canadian Kennel Club follows closely to AKC standards with slight variations in measurement preferences. Many national kennel clubs worldwide, including those in Australia, New Zealand, and South Africa, have adopted standards based primarily on the FCI template with minor regional adaptations. Regardless of the specific organization, all major kennel clubs agree on the fundamental characteristics that define the Maltese Lion Dog: the pure white, silky coat; the compact, rectangular body proportion; the gentle yet spirited temperament; and the distinctive black points on the nose, eyes, and lips that provide striking contrast to the white coat.