Generally, most dogs are fully grown at around 1ish (with a few exceptions here and there no doubt!) but when I look at pics of my boys up until around 18 months to now (they are 3) they are very different again
- they grow muscle definition and extra curly hair
so personally, I think they continue to change for quite a few years. I've got a picture of Alfie at 15 months and when I compare to recent ones, he is very different....but I didn't really notice the changes like you do when they are trippling in weight in a week
Finn and Alfie are very similar in height and size.......Finn weighs 11.8 kgs and Alfie 12.2 - when you lift Alfie, you can really feel that extra half a stone!