How can I tell the age of my Border Collie? The age of the Border Collie is determined by the state of its teeth: the milk teeth under 2 months are white and small, all the teeth are replaced and grow neatly in 3-10 months; the upper and lower incisors are partially smoothed out at the age of 2-3 years, the lower incisors are gradually yellowed at the age of 4-5 years, and the roots are exposed at the age of 6-8 years; after the age of 8 years, the canine teeth begin to fall out and officially enter old age. 1. The incisors are replaced, the canines are replaced at 4-6 months (white, rounded tips), the molars are replaced at 6-10 months. 1 year old teeth are full grown, white and shiny, incisors are not cuspidated. 2 years old lower incisors are partially worn down, 3 years old upper incisors are partially worn down, 4-5 years old upper and lower incisors start to wear slightly beveled and yellowed, 6-8 years old incisors are worn down to the roots, canines are yellowed and worn down to the lips. The older the dog, the more severe the wear. But also see that this has a lot to do with the nature of the animal’s food, such as often eat soft food and often chew bones, the dog’s teeth wear is not the same, so it can only be used as a reference. 2, facial expressions of dogs aged around 1 year old, active expression, eyes, good movement. 2-4 years old dogs, affectionate close to people, glowing spirit, enthusiasm. Older dogs older than 7 years old, mentally sluggish, slow to respond to stimuli, reluctant to move more, eyes listless. 3, the occurrence of hair elderly hair refers to the emergence of gray hair (that is, the original non-gray hair of the dog into gray hair), first occurring in the lip area, jaw area. 4-5-year-old dogs began to see a few white hairs, 5-6 years of age significantly increased, later diffused to the back, around the nose, eyelids, eyebrows and other places, and then further expanded The white hair grows on the forehead and in the external ear canal, and even the whole head hair becomes white. Dogs over 10 years of age have a large amount of white hair on the forehead, face and front of the skull. Over 13 years of age, the entire head becomes white (there are some dogs that remain the same color at 10-14 years of age). For white, yellow and white hair or chestnut with white spots hair of the dog, can not use the hair color change as an aid to age judgment. 4, action young dog activities when the body is light and dexterous, 2-5 years old when the activity is a little clumsy, but stable, safe and reliable. 10 years of age or older dogs, sluggish demeanor, back hunchback or bent back, walking slowly.
