[:-]I would say it is OK to trim the dog.
My wife had one some what the same as you say.I trimmed him each summer.he would get so hot if I didn' t.
he even got to like it.when he saw me with the clippers he would rool over and get ready.

Give it a go,or take him to the vet and have a groomer do it the first time.then you will know how. hope this helps.