I have been epileptic since birth, and there is no way I would wish this upon my boxers. A friend's dog was epileptic and, unfortunately, he had to have him put to sleep, as the seizures were so bad. At least with people, they are aware what epilepsy is, and whether they get a warning - I am unable to do anything to prevent it - or not, they still know they have had a seizure, and that medication is being used to help them. A dog has absolutely no idea why it is having these episodes, or what is happening. It cannot tell anyone how it is feeling, is it well or ill enough to be euthanized? A child/adult can relay it's feelings to parents/doctors to, consequently get the best treatment for it's particular problem. I have never wanted children, and would never feel the way about my babies about kids. Imagine how you feel about your kids; that is how we dog parents feel about our guys. Even if you cannot understand this, respect it.
I agree, you are advised not to go into the whys and wherefores too deeply regarding the circumstances of a missing/stolen pet. If Scruncher was stolen and, if this was the case, he will be well taken care of to be in a desirable condition to sell on, how was he transported from the towpath to wherever? Even carrying him to a vehicle, a bulldog is a heavy dog, so it was probably a guy, an adult male.
The ironic thing is, if the perpetrator contacted Jill, anonymously, he would get more from her to get her baby back, than from a possible buyer. She would even promise not to contact the police, or do anything which would be detrimental to Scruncher being returned to her.
I would employ a private detective - this may seem excessive - to find out what happened to my guy, and get him back. You know your own dog and Scruncher going missing was completely out of character for him Jill says. So I have no doubt he was stolen, and the reason why.
I hope returning to work is kind of like therapy for Jill, by occupying her mind with things other than the trauma of missing Scruncher. I know I couldn't do it. But we're all different.