Yes it is true that different formulas may work better for different dogs, just like different foods may work better for different dogs. A lot of these companies mentioned have great products, it may just depend on your dog and your preferences (if you prefer non-GMO, etc). Not sure if they have been mentioned, but another one to look at would be The Wholistic Pet.
Companies that follow AAFCO’s labeling requirements should be very easy to compare enzyme activities. They should say something like “Papain…. 350mcg amino acid liberated/min/g”, and you can compare that to another one that says “Papain…. 300mcg amino acid liberated/min/g”. Papain is one of your proteases, along with Bromelain. They also may have another enzyme listed just as “Protease”- this is probably a protease from a fungal source (whereas Papain is from papaya and Bromelain is from pineapples). But, all of these have protease activity. Feel free to let me know if you have any questions about the enzymes and how they work, etc.
