Try to spend a few hours with your future pet, to see if you get a reaction. If allergies or asthma are already a serious problem, consult your doctor before you make a decision about getting a pet. Different pets require different amounts of care. Active dogs, for instance, require training, plenty of walks, daily exercise, and play sessions. It's a good idea to play with and handle gerbils and hamsters daily, to keep them socialized and friendly.
Many exotic pets require fresh or specially-prepared meals.
Parents will often buy a pet for their children, hoping to teach responsibility, only to find themselves cleaning cages and setting out food bowls a couple of months later. These are all time and emotional investments that should be shared by all family members. Know the average life span of the pet you're considering. Your pet will become a member of your family, and will depend on you for care. Be aware that your pet will require a financial investment from you, as well as time and love.