Woman with a dog destroys toddler's ball

I have no prejudice towards people with dogs in general but here is another incident I encountered involving a dog owner. As the toddler was playing with his ball, a dog grabbed it and destroyed it. The owner just apologised and walked off. The mother had to say to her son, say bye bye to the ball. How can someone just destroy someone else's property and walk away like this? Is it not common courtesy to at least offer compensation?

I was also involved in a similar incident when I was around maybe 15. I was playing tennis when a youthful looking dog bounded into the court and grabbed one of the new balls (which I rarely bought but I digress). After it had deposited enough saliva and exercised its jaws enough by gnawing, the ball was ready to be placed in the bin. The owner who was much older than us just said an empty apology and walked off? I was quite taken aback by this nonchalant behaviour but I managed to draw his attention to the fact that a tennis ball in the UK is very expensive and asked for some money to contribute towards it. He just made another excuse and walked off.