I assume that you want to deter cats from coming into your garden to eat the food you put out for the hedgehogs. I know little about sonic repellents but read a few posts back that someone had observed their visiting hedgehogs had been affected by the one they had used. My experience over the last few years of feeding the birds and hedgehogs (for what it’s worth) is that if you feed one species you will invariably attract an/other and I have had to adapt the way I feed both in order (in my case) to deter rats. In doing so I no longer have the pleasure of watching the squirrels antics as I have to use cages, trays etc to catch falling food. In terms of the hedgehogs I supervise their feeding from March until they stop visiting usually in November. I have read that feeding stations help deter the predators so maybe this would be an option. Best wishes.
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