
What a lovely breed, never seen them in UK, only seen the breed when at completions in Europe.
I have GSP and imagine they are similar. I find I need to feed 1o- 20% more than feeding guides on most foods and feed three meals until at least 10 -12 mths or they can run up light as juveniles. I feed a mid range three star food and find these suit my GSP better than the 80:20 premium brands where feed quantities are lower, my dogs were always hungry. they were also too light in condition IMO ( low body fat so no reserves if injured or unwell ) when I Increased the feed rate they got loose bowels.
Some GSP can be a bit anorexic ( never had one myself all mine make labs look casual around food ) if the breed is prone to this the 80:20 foods may be ok as extra calories / gram