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a group of foxes is called a skulk but no animals live in a skulk
A group of dogs is called a pack.
There may be a different name for a group of hunting fox hounds, but I don't know it.
The plural of skulk is skulks.
As in "the child skulks in the corner".
The word 'skulk' is a verb (skulk, skulks, skulking, skulked), to move in a sly or secret manner, to sneak.
Foxes don't hunt in groups, but they may be called a "skulk" not a pack - that is wolves.