all animals have emotions, that is why so many people are against keeping animals in zoos , circuses etc. They show their emotions in much the same way as humans do
stressed animals often pace or rock back and forth or round in circles, scared animals cower, apes and monkeys will pull out their hair as a form of comfort when stressed or bored much like troccithingamybob. have you never seen an animal get spooked when there is nothing there??
If you get to know an animal group, you can easily see the way they show love, anger, fright etc.