Hi Kaffe,  Fizzy and Scooby get one called Animal essentials Plant Enzymes & Probiotics, for dogs and cats.   I have not vetted the ingredients  but the label says  "All Natural Digestive Aid"  "Contains a source of live (viable)naturally occurring microorganisms.  Replenishes beneficial bacteria (probiotic) that support digestive flora and enzymes that assist with the breakdown of starches, proteins, triglycerides and fats, and cellulose (plant materials and fiber) in the diet.  Contains no lactose, sugars or preservatives."  Ingredients are Calcium sulfate, dried fermentation products of Aspergillus oryzae var., Aspergillus niger var., Bacillus subtilus var., Trichoderma longibrachiatum, pineapple, Bacillus coagulans.  Refrigerate after opening.

I think this brand is pretty common at the little pet supply shops, not the big boxes.  I sprinkle 1/8 tsp on the wet food twice a day.   I started using this for Scooby when she had the runs from antibiotics and food that she didn't tolerate well.  Cleared it up in a day!  They don't notice it in the food.  I've been using it for about 8 months.  I know there are several products out there, but I've only used this one.  HTH

I have tried Purina FortiFloria with minimal success along with a wide variety of others, both as food additive and treatment for problems. I didn't find one single powder that worked for issues we've had here.

The one I've had the most success with and constant success with for extremely loose stools in Geneva(rb), this product stopped them, and minor issues for the others when I brought them home or with antibiotic treatments, and even for Scooter's swollen lip allergic reation is Vetri-Science Fast Balance-GI.  It consistently worked.

The pitas will voluntarily consume what I give them of this, while hairball formulas are summarily rejected. So there is something about this they found acceptable.

Ling is a scarf & barf and I'll give her a tiny amount to settle her tummy down when she'd done that.

Maybe it has no meaning as far as using it, and maybe it's the foods they eat plus this, but I don't have hairball barfs here and I've tossed the hairball formulas.  I've never seen Scooter or MK barf a hairball after I started using this. Ling's aren't hairballs ( I examine her barfs) but from "inhaling" foods.

It's a bit pricey, but it ended up cheaper using something that worked than all I spent on trying to find products that worked alone or ones they'd actually allow mixed in their foods:

http://www.onlynaturalpet.com/products/Vetri-Science-Fast-Balance-GI/125021.aspx

I've used/am using Animal Essentials. I don't give it regularly, just when I notice that stool consistency is softer than it should be, and things return to normal very quickly. My cats rarely throw up, but Sophie and Stefie occasionally get a bit softer stool.

     I have been giving RC  Nyzymes  granules  for the last couple of months and also the ox - e drops. This product is for people , horses, cats and dogs.  There are some formula just for pets or just for people or like in the granules, ox-e drops and black leaf for pets and human
                              http://www.nzymes.com/product-granules.htm
                                       kathy

Prozyme is one of the few that is decent in the LABELED for Pets ... I usually use kyo dopholis for the four legs ... Make sure to use a PREBIOTIC to so the Pro s have something in the gut to adhere to ..

I have used several human brands and a few pet ones ... the above have both undergone tests for potency and PASSED many companies label billions but they are DEAD and useless

Thanks, Peg, that looks like a good one.  That line of supplements sounds good - do you order online or get them locally?