how big is he gonna be??

Vet says he’ll be big when he’s full grown, even for his breed but I’d like some real life advice He’s my first dog and wanna know what I’m in for! He’s 3 months old

Vet says he’ll be big when he’s full grown, even for his breed but I’d like some real life advice He’s my first dog and wanna know what I’m in for! He’s 3 months old