I don't think dogs have *all* the feelings we do--or rather, at the same level of complexity--but I do believe they can feel depressed, jealous, anxious, etc. For example, if your dog wants to play with you, and you tell him "no," he may feel disappointed, but I doubt he goes through the same analyzing of his feelings that a human might, e.g. "But why DOESN'T she want to play with me? What did I do wrong?"

Hope all is well with Jake!