Adult Maltese range from roughly 3 to 7 lb (1.4 to 3.2 kg), though breed standards, as a whole, call for weights between 4 and 7 lb (1.8 and 3.2 kg). There are variations depending on which standard is being used. Many, like the American Kennel Club, call for a weight that is ideally less than 7 lb with between 4 and 6 lb preferred.
Maltese are bred to be cuddly companion dogs. They thrive on love and attention. They are extremely lively and playful, and even as a Maltese ages, his or her energy level and playful demeanor remains fairly constant and does not diminish much. Some Maltese can occasionally be snappy with smaller children and should be supervised when playing, although socializing them at a young age will reduce this habit. The Maltese is very active within a house, and, preferring enclosed spaces, does very well with small yards. For this reason the breed also does well with apartments and townhouses, and is a prized pet of urban dwellers. Maltese have a bad reputation as yappers.
An Australia-wide research project (but not in Tasmania) in conjunction with RSPCA found owners likely to dump their Maltese terriers, citing their tendency to bark constantly. This breed is Australia's most dumped dog.
Health:
The Maltese is basically a very healthy breed with few medical problems.
With good care and regular veterinary check-ups you should expect your Maltese to live well into his teenage years.