How old can a Sheltie be trimmed? How old can a Sheltie be trimmed depends on whether it has been vaccinated or not. If you do not finish the vaccination, you will lose the protective layer of hair and you will get sick easily. If the season happens to be winter, the owner must pay attention to keeping the Chenery warm by putting a shirt on him after trimming and covering him with a cotton blanket at night to prevent him from catching a cold. Before trimming the Chenery’s hair, carefully comb the dog’s body with a comb to smooth out all the hair, especially the tangled and knotted areas. If the knots are too difficult to comb, you can also use scissors to cut them off.
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