How to judge the age of a Border Collie? The age of a Border Collie can be judged by looking at the development of its teeth. At 30-40 days, all the deciduous incisors will be in full length; at 2 months, all the deciduous incisors will be in full length, tapered and tender white. 2-4 months, the first deciduous incisor is replaced; 5-6 months, the second and third deciduous incisors and all deciduous canines are replaced.
Over 8 months old, all teeth are replaced by permanent teeth. At 1 year old, the permanent teeth are all long, bright and tough, with sharp protrusions on the upper part of the incisors; at 1.5 years old, the peak of the first incisor tooth of the lower jaw disappears. At 2.5 years old, the peak of the second mandibular incisor disappeared.
At 3.5 years old, the peak of the maxillary first incisor disappeared. At 4.5 years old, the peak of the second maxillary incisor disappeared. At the age of 5, the peak of the third mandibular incisor was slightly worn, and at the same time, the first and second mandibular incisors were ground into a rectangular shape. At 6 years old, the peak of the third mandibular incisor disappeared and the canine teeth were blunt and rounded;
At the age of 7, the mandibular first incisor was worn to the root of the tooth, and the wear surface was vertically oval. At the age of 8, the first incisor of the mandible was worn and tilted to the front line. At 10 years old, the wear surfaces of the second mandibular and maxillary first incisors were longitudinally oval in shape. At the age of 16, the front teeth were lost and the canine teeth were incomplete. 20 years old, canine tooth loss;
Adult dogs are still quite big. The Border Collie itself is a huge dog, with a length of about 55-61 centimeters and a body weight of about 26-31.5kg for male dogs and 25-27kg for female dogs.