No - it doesn't sound like aggression to me either. Judging from his past, I'd say he had no socialization skills and his new lifestyle is totally new and exciting to him. Perhaps if you have friends with dogs, he could be introduced to them so he can learn some new skills and manners. I really don't know how you would go about this, but I'm sure other posters can give you some suggestions. I don't walk my two guys, since they have acreage here which to play and exercise on. However when they do go to the vet or groomer, they behave. I guess they just learned that on their own over a period of time.
As for Alfie nipping when you brush him, you might want to try a plastic grooming rake, rather than one with metal teeth. Even with that, my guys will occasionally nip at me if I happen to catch and pull on a matted area, so I try to find them first and just cut those out with scissors, rather than comb thru it.
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