Growth charts are always averages, so you can't strictly go by them. However, I think it's important to see "growth" in some kind of preditable pattern.
My first male followed that chart pretty closely, maybe a pound of two higher and he finally matured to about 85lbs. He put on about 10 lbs a month until about 7 months when his growth slowed significantly.
My female also followed this chart pretty closely. Putting on a consistant and predictable amount of weight every month. Her mature weight is between 65-70lbs.
My most recent male, just turned a year old more closely followed the female growth pattern. While not a small dog, he's not a big male either. At a year old he's between 65-70lbs. I expect him to fill out to about 75lbs.
What would concern me more is not necessarily the numbers, but the growth. With these charts you can also get into the whole month vs. week thing. When does he hit his "month" mark can have some good variation vs the "week" mark. I remember when Argos was 24weeks old, he still had 2 weeks until his 6 month day.
What did he weigh when you picked him up? How was his body condition? I've seen fat puppies that don't put on much weight and get skinny, but they were fat to begin with and have since grown into that gangly awkward stage. Soem puppies are smaller as well, If when you picked him up he was a 12lb pup and now he's 18 lbs a month later I would consider that good growth. However if you picked up at 8 weeks a 16lb puppy, and in 3 weeks he's only put on 2 or 3 lbs, I would probably check him out with the vet.
Bianka vom Eisernen Loewen IPO3, CGC, TC 1-3-08
Cade vom Eisernen Loewen IPO1, CGC 3-25-09
D'Artagnan (Tag) vom Eisernen Loewen BH 2-2-10
G Aiko von Burkndeiros SchH 3, IPO3, FH, TC, KKL2 9-17-02 (Retired)
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