The movie "Dinocroc" 2004

After finding an African dinosaur ancestor of the crocodile, Dr. Campbell uses its DNA to create prototypes at Paula Kennedy's Genetic Research Laboratory (Gereco). However, one has to be put down after killing someone, another escapes and the information is kept from Sheriff Harper. His daughter, county dog catcher Diane Harper, helps her ex (welding artist Tom Banning) with his brother Michael's beloved dog. They run into Campbell and discover that the dinocroc is growing, having escaped in a tunnel. Although Gereco hires an Australian crocodile specialist and intrepid hunter, Richard "Dick" Sydney, the beast proves impervious to bullets, so the body count rises alarmingly.