no to old
yes
Yes, vaccinations are not 100% proof against disease.
my 7 month old Shih Poo is extremely well behaved but can have mischievous once in a while but overall Shih Poo's have an amazing temperament and the breed love to please people.x
They do play rough. Yes, I have gotten bitten by my shih tzu, but it was because he was 1 month old and still teething. They do tend to nibble when they are playing!
parvo parvo or heartworm
He very well may have Parvo. It is very important to get him to vet ASAP
Yes, most Shih-tzu do lighten as they get older.Male ones lighten more than female ones.
It is actually possible--see a vet if you suspect parvo ASAP.
When a 9 month old shih tzu female puppy and a male 11 month old puppy get stuck together when the female had gone into heat, it is possible she can be pregnant.
Cats do not get parvo; it is a canine virus that primarily affects dogs. Cats can, however, get a similar virus called panleukopenia, which is sometimes referred to as feline parvovirus, but it is a different virus that affects cats specifically.
Your Shih Tzu sounds like a big dog for his breed! I have two shih tzus and one of mine was just like yours. He is 4 years old now and he is 15 pounds so probably around there. If he is more gradual about how much weight and muscle he or she gains he will probably be around 12 pounds.