Perhaps Higgs used the tray because she didn't want to go outside, or she wanted to dominate James? You could buy two more trays and see what happens.
Higgs has never used James’s tray because she can’t get in it- it’s a top entry one and she can’t work it out.
I don't have any more third-hand tips I'm afraid. Maybe it's time to buy a cat psychology book? Your scenario sounds quite unusual, what with the cats having such different regimes, and the imbalance in the fighting.
I love that Higgs doesn't know how to get in the tray. Poor silly Higgs.
@Dammit started
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Perhaps Higgs used the tray because she didn't want to go outside, or she wanted to dominate James? You could buy two more trays and see what happens.