It is kind of typical for the breed of those I personally know. Most seem to latch on to one person and growl and snap at the others. It could help if your mom became the food person. Especially with a chub food is very important. If you are afraid of more weight gain weigh the treats and real meat would be best and cut that much out of the meals. Don't feed according to what the dog weighs but what it should weigh. Use a high quality food with no grains, this one does not need the extra calories in grain.