How much Heartbreak is too much Heartbreak?

Ian is sensitive and I will never be one of those parents who tells their kids that their dog has gone to live on a happy farm. I believe kids have the right to greive too. Ian's fish, of whom he paid very little attention to, died last week. He cried and creid and cried. We got some new goldfish and he named his Sad. Now the goldfish have died to, so the question is do we replace them and skip the second (third and fourth) round of heartbreak or do we let him greive agian, and again?

How much heartbreak is too much heartbreak?