That can be a tough one. I have one who has a tendency to hoard toys. I've worked real hard on it and he's improved immensely, but I still have to watch him. Strangely, he never had any problem with the food bowl.
What I did was put all the toys away and bring them out only during supervised toy time. At first, I leashed one or both dogs and played with them. When play time was over, toys went away. It's a lot of work, but I saw results pretty quickly (weeks) and eventually (after months) I was able to leave toys out again. When he has a setback, we go back to Square 1.
Another thing that helped was giving my other dogs their own toys -- ideally a toy the hoarder regarded as low value. Jack got a rubber toy that he really liked and Eddie didn't. That solved the problem.
Good luck. Here's a link to a book that was recommended to me.
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Mike ~ Doting Dad to Jillie, Harper, Molly, Cooper, Eddie (RIP), Lucy (RIP), Rusty (RIP) and Jack (RIP).
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