My mum has had a dog for a couple of years now from being a pup. It's from a reputable breeder, and is beautiful and lovable but he's an absolute untrained nightmare!!
Several of her grandkids won't visit due to the dog. He's too big, bouncy,, and loud. One of mine will only visit if the dog can't get to them, and instead of moving the dog to another part of the house my mum says my child can go in a room on their own with the door shut.
Its knocked over an adult before in the street. It's knocked a child over too. My mum has been almost pulled over by him a couple of times walking him on a lead and I'm worried he will injure her if she actually does get pulled over.
Dog has no recall. Pulls on lead. Barks so so loudly all. The. Time. 
My mum let's the dog sit with his face hanging over her food plate while she's eating and just laughs.
It's putting us all off visiting.
Neighbours have moaned about the barking.
She says it's due to lockdown but realistically he could still have been walked just as much, trained and socialised etc. Mum works from home and dog is very needy of her eg barks when she's on the phone, knocks phone out of her hand, barks if he's not being talked to etc.
I know realistically there's not much I can do, but it's so frustrating that nothing has changed and I'm worried about him injuring her, and I'm sad for my child that essentially gets put in another room if we visit (which I've decided we won't be doing, I feel its not a nice message to my child tbh).
Im not sure why I'm posting really, other than to get it off my chest. I can't control what my mum does, it's just a worry.
I'm a massive dog lover, we have a dog too but mine is quiet and well trained. I put a lot of time into ensuring good recall, nice lead walking etc. He is a smart, beautiful dog but currently like a huge spoilt noisy toddler in a dogs body.