On 05 April 2019 we took Luuks little Brother Kayne to Luxembourg at the age of 9 Weeks. In this Video you can see the first contact between Luuk and Kayne and how they became best Friends :)
Sorry just read your comment now. Just my Opinion, all GoldenRedRiver and Kooikerhonje may be different: A Golden Red River is a really nice dog, but at bigger size then a Kooikerkondje. GRR are more lazy, couch potato, but really good friend to human. Kooikerhondje is a great Dog, for me the perfect size (40-50 cm), family friendly, they are really intelligent and they dont like to stay all day at home doing nothing.. you need to train with them, for exemple: great dogs for men trail (people search in rescure) or sth else... at least my 2 boys. Both are great Dogs..