I'm upset at a cow being killed in a horrific way. I don't care as much as a human being killed in a horrific way. I'm sure that a pig feels pain just like a human. I disagree that we are "just another animal."
If we are just another animal is more a philosophic kind of question I don't aspire to answer. Still it's easy to see that we are an animal and we have a lot in common with them. And even if you consider human suffering more important than animals', consider the amounts. There are around 60 billions land animals killed every year, that is 10 times more there are people living. Not every human on Earth is suffering dramatic conditions, while more than 90% of those animals do.
Do you mean to imply that one human suffering will always be worth than any number of animal suffering? That would make animal suffering worthless forever.