
I would have to say you have a very untypical toy if it is almost the Maximum height of a Minature. Often pups being living things will grow a bit larger or stay a bit smaller than expected, but 50% taller seems an awful lot.
Did he come from a well known kennel? Were his parents eye tested?
the reason I ask is that if his breeding is dubious he may not be waht he is supposed to be, but on the other hand if he came from a reputable breeder he just might be a throwback to the times before the sizes of Poodles were seperated when they were all bred together, and the smallest ones shown as toys, bigger ones as Minature etc.
I wouldn't expect him tom get any taller though at his age, just fill out.