Puppies are extremely playful, but many cats are not. So when you put a very playful puppy with a cat that wants nothing more than to be left alone, sometimes sparks fly. Sassafrass, or Safie for ...

chen yifei/iStock / Getty Images Plus "My cat used to know exactly which step to sit on to smack my head as I walked past. I'm the shortest in our house so he didn't do it to anyone else but me ...