We have a 4 year old French bulldog who has always had some difficulty with his food. For a year and a bit he was initially on Tails, then we switched to Forthglade, and then Aatu (these switches were spread over the course of 4 years). The reason for the switch each time is because he becomes less and less interested in the food, skipping eating entirely or just having a tiny nibble. With Forthglade he refused it so often he started to lose quite a bit of weight.
We've always given him primarily dry food, mixed with a bit of wet to make it interesting - because when he was a puppy he quickly decided dry alone was boring. We keep the dry food as chicken, and then rotate the flavours of the wet.
He's never had particularly great poops - usually the first one of the day is fine and then any subsequent ones are very soft. He has regular health checks and the vet thinks he's in good condition. They don't have anything useful/new to say about his poo or his food.
I think we're back in the same place again where he's starting to lose interest in the Aatu, so I have tried once again to switch him to something new, this time opting for True Instinct Natures Menu. Whenever we've switched, I've always taken care to manage the transition slowly and carefully. With this transition I've gone extra slowly because I had tonnes of Aatu left. However, even on a ratio of 50% new: 50% old, he has become much more flatulent than usual and all his poops are extremely soft. This is after two weeks of this ratio.
He likes the new food but it doesn't seem like it's agreeing with him. The problem is I obviously don't want to be jumping about from one new food to another because that won't help him either... but if we stick with Aatu I'm also worried about him getting back into the mindset where he refuses it entirely. Because of his upset stomach, this evening I offered him a ratio of 90 old:10 new, and he rejected it. This could be because his tum isn't quite right, but it could also be because it was mostly Aatu, which we think he's going off.
To help him reset after an illness in the past we have given him chicken and rice - but he no longer eats the rice at all, so this isn't particularly viable. Feeding raw isn't an option for us because we don't have the freezer space or the time to make it ourselves fresh. In terms of treats, he was being given too many by my partner but this was then strictly reduced, so he shouldn't be refusing food because he's already full up.
Would really appreciate any thoughts. I just want him to be happy and healthy. My partner is a fussy eater too, I feel like I'm the only sane one in the house.