Completely agree with pitlove- 4 is not thin by any sane Wolfhoud/GSD standard. Since this only started post-antibiotics, then the cause/effect relationship seems straightforward. Keep in mind: Antibiotics are exactly that– anti-BIOTICS. They aren’t snipers; more like land (or gut) mines. They indiscriminately kill everything biotic (living). When they show up in the dog’s digestive system, they kill off all bacteria. It will take your dog’s body a minimum of 4-6 weeks to regrow and replace the good bacteria in her gut.
I also agree that a change in food would likely only exacerbate the problem. However, while adding probiotics to help her rebuild her insides is good, using human-food yogurt is not the way to go. Cow-based dairy products are very hard on dog stomachs. (If we were talking goat yogurt from your own goats, it might be easier, but that’s a whole different discussion.) Talk to your vet about an alternative probiotic for dogs. There are plenty out there, and you can usually get them from Chewy for far less than the average vet or pet store.
You may also consider a tablespoon of canned pumpkin in her food once a day for a few days, as this may solidify her stool and help restore and regulate her digestive function. (No fussing about “canned pumpkin isn’t real pumpkin”, now…this isn’t the Pick-On-Libby Dog Food forum, after all)
Finally: Using antibiotics can also trigger reactions in parasitic organisms hiding in your pup. When one part of the system is weakened, such parasites as worms and flukes can take advantage of that weakening and increase their attacks on the body. This often occurs with newly re-homed puppies, which is why a new pup obtained at 8-12 weeks should be taken to the vet for a checkup after arrival and some upset tummy should be expected. (Stress, in this case, is similar to the use of antibiotics in that it weakens one of the body’s defenses, causing previously unseen parasites to sometimes rear their ugly heads!) They might also die off and require flushing out of the system, which may prolong the diarrhea episodes. You might want to get her checked for internal parasites.
Personally, I use Victor Grain-Free food on all my Saints, and have had great success with it. Whatever you’re using, if it worked pre-antibiotics, it’s likely the antibiotic reaction (not the food) causing her current gastrointestinal distress.
