When I was a teenager we got a doberman who I loved dearly. He died aged 8 when I was at uni from a degenerative disease of some sort.
Now my mum, 11 years on, wants to get another Doberman.
Problem is, our old dog was never allowed in the house, even in the depths of winter he was banished to his kennel. He used to lay by the garden door and sleep on the doormat - I assume because it was the closest to us in the living room as he got. My mum said she didn't want a dog scratching her floorboards and getting hair and dirt everywhere 
She also plans to continue to work full time (my step dad also works full time) with a new dog meaning no one will be in the house from 7.30am-6pm and dog left to his/her own devices in the garden all day.
I have a dog now in my own home and he's an inside dog. He jumps up on the sofa for cuddles and even sometimes sneaks in to our bed for a Sunday morning lie in. I'm at home most of the time too so my dog isn't on his own for long stretches of time and when I know no one will be home for 4hrs+ we send him to Doggy daycare for the day or get a dog walker in. I often think about my old dog and think what a sad and lonely existence he had suffered.
Should I tell my mum she is cruel and not bother getting another dog if it's just going to spend its life outside the whole time and be left for 9-10hours a day on its own??