I grew up with all sort of pets, dogs, cats and parrots mostly. My latest dog was a rottweiler and the dog before that (4-5 years apart) was a mixed race but also quite big. I live at Rönngården 3 in Mölnlycke which has nice places to go and walk the dog, a forest is right in the back of my house.
It's maybe 20-30 minutes with bus into Gothenburg centrum(Nordstan)
Sadly I don't have any toys for dogs since I threwed them out after my latest dog died of old age, so If your pets have anything it wants to play with, the owner needs to take that with them.