That is sad, particularly for a working dog. We were round at a friends house recently and a month ago they had had their German Shepherd put down, at the good age of 12 because of age/illness. She was the latest in a long line of GSDs, and they had paid a lot of money and jumped through a lot of hoops to bring her from the USA to Portugal. They had photos of her on repeat on a digital photo frame, interspersed with their daughter's GSD. It was poignant, especially as they aren't going to get another one. On a much happier note we have also been introduced to a 4 month old Serra da Estrela, the local sheep/goat guarding dog (I don't think they are so good at herding), which belongs to a neighbour. A giant teddy of a dog, and still far from fully grown. If I ever have a dog, that is the breed I'll go for. Another neighbour has had 2 of them, and they have a good temperament if you are part of the flock. I see One Man & His Dog is on Countryfile on Sunday, lots of youngsters and girls/women.
I think I know why I like your tigers so much, its the JG in there.