By Josh Wolk
Updated August 04, 2000 at 04:00 AM EDT

See dog run in slow motion, floppy jowls a-flapping! See dog shake off water, dousing those around him so they yell, ”BAY-thoven!” (the canine-comedy equivalent of a money shot). See Judge Reinhold wonder, ”Whither Fast Times?” while playing the absent Charles Grodin’s brother who brings the gigantopooch on his family’s summer vacation (and ends up — don’t ask — followed by the obligatory bumbling crooks). With the sloppy made-for-video threequel Beethoven’s 3rd, man’s best friend is his VCR’s stop button. C-