Hello everyone, I didn’t figure how to introduce myself elsewhere so I will do it here(apologies if it isn’t the right place). I am Elena and I own a Jack Russell-Terrier/Dachshund mix who is absolutely lovely and extremely intelligent, very well trained and behaved, neutered but there is a small BUT- he is very possessive of his toys, he takes fluffy dogs as his toys such as cockapoos(maybe due to their kind and submissive nature) and he will occasionally attack other dogs when they attempt to take his ball or try to hump his fluffy friends. Most of the times I get him to walk out of the situation and calm down but on the odd occasion he attacks the dogs and I am trying to correct this but it’s working for a little while and then he goes back to it. Could you please give me some advice? Attaching photo of little Simba ) Thank you.