I want to get a dog but I have to work, how does everyone on broadway market do it ?

I've looked after other dogs with no incidents but dogsitting last week really made me think long and hard about ever getting one of my own. Big problems with recall if he saw anything vaguely interesting in the distance, playing up constantly if he didn't feel like he was getting enough attention (mostly humping/tearing up his bed despite being neutered), horrible separation anxiety that meant one of us couldn't even retrieve a parcel from outside the flat door without him howling and crying (even if the other was sitting next to him). He even regressed to his puppy behaviour at one point and bit my leg when I tried to jog with him. He's a sweet dog when he's tired out after a run but he is very wilful if he really wants to do something and 'forgets' how to even sit, just barks impatiently. I don't know if it's the terrier part of him causing that because pure whippets I've spent time with seem more placid.