I have a newfoundland, german shepherd, lab mix how big will he be when he is full grown? He's 7 months old and weighs anywhere from 58kg-65kg.

Every dog is different, and even purebreds don't all fit into a neat little mold where you can determine their full grown size.

When you get a mix it's really wait and see. All I can say is that he'll most likely be big, because all the breeds in his genetics are large dogs.

Hopefully not as big as this one: Giant George, Guinness World Record Tallest Dog

275 lbs, 43" tall and I believe 7'3" long and sleep in his own queen-sized bed.

Likely he will be big, the Newfoundland dog alone would give him big genes.

KISS that dog is huge, but I wouldn't quite say he has to bed over to drink from the sink lol.