Hello from Eva the frenchie pup and family

we have a 4 and half month frenchie plus two little boys 7 and 5 they are best of friends and fabulous, she is the best puppy full of fun love enthusiasm...oh and stubbornness. I do have a little worry though and wondered if you could help ? She has a VERY under shot jaw, over the last few weeks it's become really prominent and her teeth can be seen when she is relaxed. I am worried that this will become a real problem for her any advice ?