Yes, Maltese dogs are smart.
Maltese puppies can be fully housebroken in 1 to 4 months compared to other breeds that can take up to a year.
They also learn training commands fairly quickly compared to other breeds. They learn new commands in under 25 repetitions on average. Some breeds of dogs need up to 42 repetitions over a longer period of time to learn new commands.
Maltese are also very observant. Without any training Maltese will understand what certain sounds around the house mean very quickly. They will learn all by themselves when you’re about to leave the house or when it’s bath time.