A seven-month-old Bichon Frize will still grow, but the growth rate will be slower than that of a 5-6-month-old dog. Generally speaking, dogs will not be basically finalized until 10-12 months old, and 8-9 months old. It will enter the sexual maturity period and appear for the first time in estrus. It will not be until the Bichon Frize is one and a half years old that the height will be completely fixed. This is the real skeletal shaping, but the weight will still change.