HootyMcOwlface Off you go Hooty, we'll join the queue behind you. Oh, except for me of course. My DD says she "Wouldn't dare make a fuss about an injection because of what her mum would say/do" mmmmmm what would I say/do I wonder? Well, it worked anyway.
You know, there is a new stance regarding therapy. Instead of going into people's past and letting them understand when and why they became stuck in a an unadaptive or problem behaviour (maybe a phobia), therapy now starts with changing the behaviour. Living in the moment and just doing the thing that you say you can't do. It has been found that, when people are made to do the avoided behaviour, they decide that it is ok after all. An example is of a child who would not put his head under water. Nobody deliberately made him- don't worry! But one day he slipped into the swimming pool, falling in and going under. His mother, watching, jumped up and was ready to help her terrified son... who... got out of the pool... and... did it again, and again....
OK this is a very short-hand explanation and there is far more to it.
However, hypnotherapy can be very good but please be careful who you go to, as there are charlatans out there.
Also, if you get a book and learn how to relax, and learn what to say, you can do a guided relaxation with your grandson or whoever needs the help.
For the big dog phobia: My feeling today is, if you can, ask a friend with a very gentle big dog to hold her dog and start by being near the dog for longer periods at a time, finding out that even though you feel fear, you are in fact ok. Then gradually move on to gently touching the dog, just briefly and slowly building this up. There is nothing like doing the actual thing for proving to yourself that it is ok after all!
Good luck!