I don’t know 🤷♀️ that the RSPCA/ASPCA/police/other authority would do anything. It is probably quite common for people to get dogs 🐶 and leave them alone for a few hours. As long as they’re not leaving the pup 🐶 home alone for more than four hours, they most likely wouldn’t do anything. Unless there was just cause like neglect/abuse that was enough to warrant an investigation, they probably wouldn’t do anything.
Also, why don’t you kindly offer to dog-sit for them or at least take their pup 🐶 outside for exercise (providing they’ve had all their necessary shots to be able to go out, and are only exercised appropriately for the age and breed)? If you can’t do any of that, why not kindly suggest that they hire a dog-walker or dog-sitter to look after the pup 🐶 whilst they’re out, or get a good friend/family member who knows a lot and cares about and loves dogs to dog-sit and/or take the pup 🐶 out when they’re out.
Best Wishes to all,
Have the best day and night ever!