I'm not familiar with either food, and you are giving measurements in metric, so I'm assuming that you are outside the US? It's possible that the food he's on now just doesn't have the calories he needs.
Has he had a stool sample taken in to the vet to be checked? I'm also not familiar with the dewormer you are planning on using, but unless it's a broad spectrum medication, it might not get something like whipworms.
And yes, field line Labs are usually very lean and lanky, especially when compared to show line Labs.
Has he had a stool sample taken in to the vet to be checked? I'm also not familiar with the dewormer you are planning on using, but unless it's a broad spectrum medication, it might not get something like whipworms.
And yes, field line Labs are usually very lean and lanky, especially when compared to show line Labs.