Worried about next door’s dogs.

We live next door to a good neighbour in all ways except the way he looks after his dogs. He is out every week day on a 10 hour working shift and no-one comes to let the dogs out at all. Now that we are in winter, it is dark when the neighbour leaves for work and dark when he gets home so the dogs are getting no sunshine or exercise and it must be a long day for them. They are taken out for a slow walk n the park when the neighbour comes home but it doesn’t seem enough to me as his youngest dog is quite big and would need a run around I would think. The other one is old and slow. They are nice dogs and don’t bark all day or anything but the young one howls and cries a lot of the time and it breaks my heart listening to it. My DH will not entertain me contacting the RSPCA as he says it’s none of our business and doesn’t want to be on bad terms with the neighbour but I am concerned for the well-being of the dogs. As I say, the dogs don’t annoy us with their crying - it just upsets us listening to their sorrowful howls. What would you do? When the neighbour is at home he treats them well.