Good cans
I think Lukullus is generally one of the best brands in terms of quality/price. They're not specifically for gastrointestinal issues, but I use them mixed with pasta when one of my dogs gets an upset stomach from eating something they shouldn't. Normally, I feed them kibble (also from the same brand) because I have seven big dogs and can't afford to give them these tins as a daily supplement, but as I said, I use them when one of them is unwell and they work well.