Its human to discriminate between the two. How ? Let's have a story to support it.
Once upon a time there lived a big Landlord. He had a a big mansion. He had hundreds of acres of cultivating land. He had money in abundance. He had servants galore to work for him. He had, most importantly, peace of mind. He had cows, buffaloes, bulls, donkeys to work for him in the fields. He had .......... Well, the list is endless. He had almost all the material pleasures. Like all humans this landlord too had a week point, and it was dogs. Yes, he was very much fond of dogs. He would not care to spend like anything for their simples needs. He had a host of breeds of dogs. He had the Australian Shepherd, Bloodhound, Bulldog, Doberman etc. But the one that he most liked was the Curly-Coated Retriever. It was as dark as night. It had an unusually straight tail, (that always stood up) of which the landlord was very fond. He loved all the dogs like his family member. He did never discriminate between the two.
He fondly called his Curly-Coated Retriever "Tiger." This Tiger could always be found lingering around his master or in his lap. Whenever he would see his master coming his way, he would stand on his hind legs, with his paws rested on his belly and would bark at him. This would send tingles down his master's belly. Tiger loved this and would bark even loudly and scratch the master's tummy, lick it and do all such things. Even when the landlord had to go somewhere for work, their servants would have to make arrangements for Tiger too. After seeing Tiger so lucky, the other pets and working animals felt jealous of Tiger. They would always dream of themselves as Tiger and being pampered by their master.
But among all these pets, a donkey was always more curious than jealous about Tiger. "Why is he so dear to the master ?", the donkey always wondered. "What if I do the same to my master?! He will pat on my head like he does to Tiger." Thinking thus, the donkey decided to act Tiger.
And see the donkeys luck !(donkeys too are lucky now-a-days). He got the chance to play Tiger right away. So he thought to himself, that even time is with him. Then what to care about the master (if he likes it or not.)
As soon as the donkey saw the master come his way, he gave a loud bark (imitating the dog), ran up to him and stood on his rear legs. As the height of the donkey was much more as compared to the dog. So the donkey's fore legs hit the head of the landlord pretty hard. His forehead became black and blue, and he turned red with temper. "A donkey that you are and remain one. Don't try to get in anyone else's shoes." He got a big long rod and beat down the donkey to his heart's content as he shouted at the unruly beast. The donkey was remained alive only because some other servants intervened. That day the donkey did not get any food. The dog was watching all this and felt for the donkey.
When the donkey met the dog and asked why all things went wrong, the dog answered: "My friend you dialled the wrong number. You went to seek pity from a human. A human who is fickle minded. He loves me and loves you not. In that neither is am lucky neither are you unlucky. When I grow old he may no hesitate to do that to me, what he did to you. And one more thing, presently he loves me and needs you."
"Man always takes care of the things that he doesn't need. He looks after them well and find. But on the other hand, always neglects them whom and what he should care for, who work for him. Life is like that my friend."
The landlord should take care of the donkey because his work is more laborious than that of the dog. Which means the donkey needs more maintenance. But exactly the opposite is happening.
