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We have the same problem with Harley during the Summer months. When it gets particularly humid or hot, his appetite disappears. He will pick at his food or accept a piece of ham but just does not seem bothered by food. In the three years we have had him he has been like this every Summer. He always has fresh food, clean bowls and always has free access to clean, fresh water so it's none of those causing the problem. We've come to the conclusion that if he is hungry, he will eat. During these periods he's always been alert and playful and the same old Harley but just doesn't seem to be bothered by food. The only time I would worry is if he lost interest in walks and lost his 'spark' and in my limited experience, I would say the same to you about yours.
They do seem to have sensitive digestion as well as being sensitive dogs.
As for the neutering issue, I am the same and I completely agree with you. Harley is not a nuisance with other dogs (apart from mounting our poor Spaniel when Harley gets a bit overexcited at the letterbox or door bell!). It does ruin their coat and according to the breeder Harley came from, it can also affect their growing in that they lose all their grace and presence and turn in to over-grown donkeys. I have met a neutered Setter and he didn't look as good have done. Of course, if I were neutering to prevent something hereditary being passed on or neutering for the good of the dog then I would of course have the operation done but if it doesn't affect your dog's behaviour and he is a healthy boy then I don't see why he should have the operation done.
After months of trying to get Rigsby to eat, I've now put him on a raw diet. This morning, he ate his first chicken carcass, after a few minutes hesitation, and he's having tripe and veggie mix for tea. he seemed to relish it so I'm hoping this is a new chapter for us and I can stop worrying about his weight.