Dunkin is about 1 1/2 years old, he appears to be taller and longer then a few months ago, he also has lost about a pound, He seems perfectly fine, eating good, playing some he's never been real playful actually kinda lazy, he was up to 16 1/2 a few months ago and when I weighed him about 1 1/2 weeks ago he weighd 15.8 lbs.I am going to weigh him again tonight and if he continues to loose weight I will take him to the vet, I was wondering though if when they get a certin age if they just kind of grow size wise and not weight wise, he is not a big eater and does not like many treats at all.