Most people have difficulty of themselves as just another animal or rather higher animals. They refuse to face the fact that 96% of what can be found in their bodies can also be found inside a pig or a horse or that our DNA is 97.5% identical to that of a gorilla and 98.4% to that of a chimpanzee. 
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The only thing that makes us higher animals is our ability to think and make forward plans. Other animals can only respond to situations based on genetic writing of their brain and by repitition of behaviour. They cannot think; they can only react.
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Most people accept and acknowledge that animals have instincts that largely determine their behaviour. This instinctive behaviour is easy to see - birds sing, frogs croak, male dogs cock their legs and cats stalk their prey. These are not intellectual behaviours, so many people have difficulty making the connection between this behaviour and their own behaviours as humans, they ignore the fact that their own 1st behaviours were instinctive - crying and sucking. 
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Whatever behaviours we inherit, positive or negative, from our parents are likely to be passed on to our children the same way it happens to all animals. When we as humans accept ourselves as animals whose impulses are honed by millions of years of evolution, it makes it easier to understand our basic urges impulses, and to be more accepting of ourselves and others. It therein lies the way to true happiness. 
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All am simply stating that animals are animals, just that we are the higher type and set of animals.