
Hi mygirl :)
I sympathise totally. Obviously this experience has totally put him off finding yet somebody else to do Mr Pickles's coat in case the same thing happens again. When people (including our parent's) get to a later stage in life IMHE, they prefer to go with 'what they do know' IE, the comfort zone. :) They also (from experience) become a bit....umm...dare I say it...selfish.
Obviously you know what you can and and can't do regarding 'dog groomer course's' and could tell him that you are far too busy doing what you do - in a tactful way of course ;-). But could he or you find a local dog groomer in his area and when she is due to call make the trip on this one occasion to his house so that you can reassure him and also explain to the groomer about the situation? As you say, he's just lost his best friend and is probably feeling a bit 'wobbly' it's turned his life upside down and he's looking for some equalibrium again. Routine seems to be the favourite rite of passage at this age and when it is upturned it causes a slight -'emotional tremor'- sometimes, all we have to do as 'children', is just put the pieces of the puzzle back into place. What I'm trying to say is, there is normally more to a 'problem' than meets the eye as I know you are aware.
I hope this hasn't come across as patronising, it's just that I have too been in a similar situation to you but over a completely different subject. I hope that you work it out to you and your Dad's satisfaction :)