I hope this subject and page didn't cause you blash, because if you have a female dog with an "Innie", then this can be a serious subject matter. Look closely at the picture on the left. That is a normal puppy vulva or an "Outtie". See how there aren't any skin folds around it? It seems to be popped out with no extra skin folds.
Now look at the picture on the right. That is an "Innie", also called a recessed vulva. There are folds of skin around the vulva. Looking at it, it looks "in". If you pull gently on the hair there, it will pop out of the skin folds briefly. It is those skin folds that may cause problems for the female puppy.
Many or most cases of puppy vaginitis is due to an "Innie" vulva. This "Innie" is usually formed by a flap of skin that makes the vulva look inverted or recessed. Bacteria grows in there causing the frequent infections.
This a very common issue with all Bully breeds, especially with Frenchies. An inverted vulva is a vulva that is deeply set "inside" the puppies skin folds. This condition can cause irritation to the surrounding skin, it can also cause UTI's (Urinary Infections). The main thing to do with these girls is to keep them clean, wiping them frequently with baby wipes and applying any baby rash ointment containing zinc oxide (Desitin or generic). Here is what I would suggest: start by rolling your girl over on her back, grasp the tuft of hair that grows off the vulva, pull the hair up gently causing the vulva to come up and out of the skin fold, wipe out well with unscented baby wipe, then apply the zinc oxide ointment in the creases and on any irritated areas. If after a few days you don't see any healing then take her to the vet for a skin culture, it could be a fungus or yeast, there are creams available for those problems too. The most IMPORTANT bit of information I can give you is that if your girl does have an inverted vulva and whether it causes her any problems or not DO NOT SPAY HER UNTIL AFTER HER FIRST HEAT! When a female goes into season that vulva gets larger and kinda pops out of those skin folds. That's what you want to happen with those little girls with "Innies". Once they're out of season (heat), wait 4 weeks afterwards and have them spayed. This is really critical, the reason being is that during her first heat her vulva will swell out rather large, after their first heat most girls' vulvas never return to the pre-heat size, this can many times fix the inverted vulva problem. This doesn't work 100% of the time, but I have seen it occur many, many times in my own females. A vulvaplasty surgery is really expensive and often can be avoided if she is allowed that first heat cycle, anything that can prevent surgery is worth trying!
***PLEASE NOTE: If this puppy is allowed to have one season it is up to YOU the owner to make sure and guarantee that she does NOT become pregnant. Watch her carefully for 4 weeks from the start of her season (heat). If you are deligent you can determine when she comes into season. Average age for first season is 6 months to 18 months old. Prior to coming into season a female will generally have vulval swelling. You may notice feeling her nipples when you rub her chest. These are signs that she is sexually maturing.
Once you see these changes you need to wipe her vulva daily with a white kleenex. If you notice color on the kleenex, its a good indication she is in season. If you are not sure, have your veterinarian examine her. This is when you must be on your guard. She may forget or choose to disobey any command she might have learned previously. Her goal in life is to reproduce. It is YOUR JOB to make sure she doesn't. She is never out of your site or the site of a qualified adult whether she's in the house or out in the yard. She is to go out in the yard on leash if needed. Dogs can breed through fences so just letting her out in the yard without supervision is not an option. She must be watched for 4 weeks. If you cannot make this committment to insure her not becoming pregnant, then spay her before she comes into season and put up with the possible UTI's instead. There is NO EXCUSE for an unwanted pregnancy in your dog.