Cats

[Rduke55]

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maybe part of it is that dogs are pack animals and cats are more secretive.

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I thought of this, but don't some felines live in prides? And aren't some wolves solitary? This could be it, but I'd guess intelligence, before packs.

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ALaw is correct. With very few instances, usually due to living near humans and eating all that delicious garbage, the lone wolf doesn't exist . When a wolf gets booted form a pack it needs to find another pack soon or it will starve.
(This human connection is one of the theories about the beginning of dog domestication.)

Also, while lions live in packs and have excellent cooperative hunting, the overwhelming majority of cat species - including the ones ancestral to our domesticated kitties - are solitary or close to it.