S.K.
Hi T.,
Children do go through stages like that and some of it can be just to test boundries and it is my experience the less you yell the quicker it will pass because with yelling they get immune and you have to keep doing it louder and louder to get action but with quiet anger well of course there is a limit and the child will pay more attention to hand signal cues to stop a behavior. It does sound a bit more like grief though - a family pet can be a hard thing for a young child to lose. They don't know how to deal with the anger and fear that come from it and lash out and even adults will try to push people away during grief to test to see if they are going to come back and if they are paying attention to them. If I was you I would find a picture or 2 of the turtle and frame them with the child and let him put them where he wants and talk about missing him but he can see the animal in the picture whenever he wants. If you don't have a picture try having him draw one or find one in a coloring book and let him color it to look like the animal he misses. This might be more fun and could actually work better because the other relatives that he is having the outbursts with could ask questions about the picture and comment about his artwork and smooth over the bad behavior with positive family time. Good luck!