East Dallas Pet RescueProfessional tips provider. Boxers are intelligent, high-spirited, playful, happy dogs. Sometimes when a breed is intelligent, it is more difficult to train them. Not so with the Boxer. They are quick-learners and eager to make their owner happy. They bond closely to their human families and love to be around children, making them high on the list of best family dog breeds. When a Boxer pet is well-trained, they will get along with other pets in the family such as cats. Mainly because of their size difference it's a little riskier to hope that he would not harm a small pet, like a hamster, or a pet mouse. They would need to be supervised in the company of such small animals.