List of all Dog Breeds starting with Letter J
Jack Russell Terrier

Age: Typically live around 13-16 years.
Weight: 13-17 pounds (6-8 kg).
Size: Small, standing about 10-15 inches (25-38 cm) tall.
Characteristics: Jack Russell Terriers are energetic, intelligent, and bold dogs. They are known for their hunting instinct and may have a strong prey drive. They require regular exercise and mental stimulation to keep them happy and healthy.
Jagdterrier

Age: Usually live around 12-14 years.
Weight: 55-77 pounds (25-35 kg).
Size: Large, standing about 22-26 inches (56-66 cm) tall.
Characteristics: Huntaways are herding dogs originally from New Zealand. They are energetic, intelligent, and have strong herding instincts. They are often used to drive and control livestock. Huntaways require regular exercise and mental stimulation.
Jämthund

Age: Typically live around 12-15 years.
Weight: 66-110 pounds (30-50 kg).
Size: Large, standing about 20-25.5 inches (50-65 cm) tall.
Characteristics: Jämthunds are a Swedish spitz-type breed, originally used for hunting large game. They are calm, friendly, and form strong bonds with their families. They have a thick double coat that helps them thrive in colder climates.
Japanese Chin

Age: Usually live around 10-12 years.
Weight: 4-9 pounds (2-4 kg).
Size: Small, standing about 8-11 inches (20-28 cm) tall.
Characteristics: Japanese Chins are toy breeds known for their distinctive pushed-in faces and elegant appearance. They are affectionate, gentle, and make great companion dogs. They enjoy being pampered and are well-suited for indoor living.
Japanese Spitz

Age: Typically live around 12-16 years.
Weight: 11-20 pounds (5-9 kg).
Size: Small, standing about 10-14 inches (25-36 cm) tall.
Characteristics: Japanese Spitz dogs are friendly, intelligent, and social. They have a thick, white coat that stands out. They are known for their playful and lively nature, making them good family pets.
Japanese Terrier

Age: Generally live around 12-15 years.
Weight: 5-9 pounds (2-4 kg).
Size: Small, standing about 12-13 inches (30-33 cm) tall.
Characteristics: Japanese Terriers are small-sized dogs with a short coat and lively personality. They are affectionate, intelligent, and do well in households with proper training and socialization.
Jeju

Jeju dogs, also known as Jeju Doga, are a native Korean breed. However, specific details regarding their age, weight, size, and Characteristics are not widely available due to their rarity and limited exposure outside their region.
Jonangi

Jonangi dogs are a rare breed from India, primarily used for hunting and guarding. Specific details regarding their age, weight, size, and Characteristics are not widely available due to their limited exposure and documentation.