Billy was 1.7lbs when I got him. The sellers told me he was 12 weeks, but the vet said he looked younger---maybe as young as 8 weeks. His testicles weren't down yet. I took him back to see the vet several weeks ago, and his testicles had dropped, but he was still only 2 lbs. He's got to be close to 16 weeks now. The sellers said he was born in April. If he's only 2lbs now, the charts say he's only getting to 3.5--4lbs at full weight. Wonder if that's correct? He's growing, but not getting fat at all, just leggy. He's now 7 inches at the shoulder; he was only 5 when we got him. He's also losing his baby coat. He's a black and white long hair, but he's losing the hair now, and growing a little brownish white in on his face. Altogether an awkward look.....how old does he sound to those of you with experience?