Since they both are irresponsible dog owners all their dogs should have been neutered
I disagree that the man is irresponsible. He has rules about what dogs are allowed in his property, and only while he’s there. Some people use their male dogs for siring. Can you imagine a world where every dog was spayed or neutered? No more dogs!!
The GF and her friend are completely at fault here. The owner of the male offered to pay for a kennel for the female that was in heat. Does that sound irresponsible to you?
This man owes the friend NOTHING, and could easily charge for siring fees. That’s what the friend was trying to avoid.