Ddog has always been on the lean side (which is good for his joints as he has mild hip dysplasia on one side) but in the last few weeks he's been looking thin rather than just lean
My vet said he'd be happier if he were at least a kilo heavier - currently 16.5 kg, the 'ideal' for an adult dog of his height is apparently 19kg but his frame is slighter than average.
I asked the trainer at our gundog class what she thought and she agreed he is a bit too bony especially around his hips and spine
I've been giving him a bit more food but all that's happened is that he's pooing more than usual and it's horrible and sloppy
What are the best ways of putting a bit of weight on without upsetting his stomach?