Sorry to rain on your parade.. but I have never found a toy to entertain him.. by himself. The only thing I've ever found that keeps him busy alone is a bully stick. And I buy the thickest ones they have, the thin ones he goes through in no time.
With Bailey ALL toys interactive.
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Rhonda, Bailey, Josie and my angel Bella Rue'
"Until one has loved an animal, a part of one's soul remains unawakened."
~Anatole France~