WiLT:Why My Dog Humps My Cat
While contemplating why a customer said he was "using that Mazola Fox Firewall" I wondered if Foxes and Dogs were in the same genus, (they're not), but I did learn they are in the same family, Canidae. Unfortunately, it looks like Fox-Dog hybrids are not going to happen any time soon.
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But, I'm getting off track. Look at the bottom of that first link. Why the dog feels she needs to dominate the cat, we may never know.