I had Piper at the vet Tuesday of last week and he weighed 3.1 lbs. He had a terrible cold so he was put on meds and was unable to get his 16 week shots, so I took him back this past Tuesday, all healthy and ready to go, and when they weighed him he was a whooping 3.6 lbs. He gained a whole 1/2 lb in a week!! Is this a normal growth spurt or am I looking at a future chubba chunk? He did have a horrible cold for almost 2 weeks and was looking thin for awhile and now he looks so healthy (Thank God

) but I am wondering if it's too much weight too soon or is it just a growth spurt and he'll slow back down in weight gain?