This is the first probiotic I've tried for my cats. I chose this brand over others because it has more pre and probiotic strains with higher counts with similar prices plus this one has no added flavorings or meat proteins in it and it is also veterinarian formulated. Many other brands say they have certain certifications and are vet formulated but they don't have decent information and proof on their websites. Fera's website has more information on the product and the vet who formulated it. The supplement does have a slight but not deterring odor and is tan in color. I'm on my second container and now all six are getting it on their food. Be aware the container is only half full and the company says it's a required and safer size package for processing (they're not the only company that has this response either).5/6 have no issue with the meat protein and they're the ones that got the entire first container. I saw a difference in their coats within days. It also helped with their bad breath, vomiting, and our old man kitty's body and ear odor. You could tell he was around as soon as he walked in the room until he started getting this on his food! I didn't notice a huge difference in litter odor though.Now my baby, she has skin issues caused by a possible food allergy, is possibly epileptic (on antiseizure meds twice daily), slight hypercalcemia, and reoccurring urinary issues (probably caused by the stress and hypercalcemia making her more prone to uti and calcium oxalate crystals and stones causing her to be on antibiotics frequently). No diagnosis yet unfortunately. Because of those issues she has to avoid all additives and is on a soy based diet to rule out food allergens but since shes frequently on antibiotics she needs something to help with her gut and overall health and there needs to be no meat protein. I originally purchased it for her but she didnt get any until the second container. She turns her nose up at her food half the time because she can smell it (the others were the same way at first but they ate it when they got hungry enough and have no problem now) but the jury is still out for her. I'll update when shes eating it consistently.It does come sealed, has a pack inside to keep it from getting hard and clumping, and comes with a scoop. I do keep it in the fridge after opening to prolong the life and for piece of mind even though it's polished off well before the date. The cats seem to eat less now that it's hot and humid (no AC) so I'm not sure how to adjust the feeding schedule. I'm worried the weather is making the probiotic and in turn the kibble spoil. Overall it's expensive with this many cats but it definitely improves their health so I will continue purchasing.I almost forgot, our black shepherd has been breaking in and eating the cat's food without any vomiting or diarrhea as a result so I though the cats were just being piggies and begging for extra food. Little did I know they were actually hungry because Oolee is a jerk lol! I guess I can say it works for dogs too because he had zero stomach upset with over a cup and a half of cat food multiple times. It took a few times but I figured it out by noticing the cat's dish was licked clean (the last tine the bowl was still wet and bubbly with drool lol). When the probiotic is on their food (I mix it in for even distribution to make sure one cat isn't eating way too much) it leaves a residue on the bowl when the food is gone. I wash their bowl daily to prevent bacteria growth and spoilage.