Our 5 month old spaniel is fed Millie's wolfheart countryside mix. He is fed 3 times a day but struggles to put on weight. If we feed him more at his meals he gets loose stools (which Millie's say means he is having too much kibble), but on the current amount he's not filling out like I think he should.
He previously had a campylobacter illness which caused diarrhoea but this has now cleared up and although gaining weight doesn't seem chunky enough for his breed.
We are thinking about changing to another grain free food but even after looking on all about dog food I feel a bit lost. Any advice?