I DONT THINK CHASEING SOME RABBITS IN SUMMER MAKE,S A DOG JACK,, INFACT ITS BIN COLDER THAN SOME OF THE WINTER DAYS ,,LOL OK BECAREFULL WERE YOU RUN THEM, THE LAST THING ANY ONE WANTS HIS A TOE INJURY ETC,,,BUT THATS DOWN TO THE OWNER PUTTING THE DOG ON THE RIGHT OR WRONG GROUND,,, IM HOPEING TO GO 2NITE WITH A 13 MONTH OLD DOG,, IT WILL BE ON SANDY GROUND, IT EITHER THAT OR THE DOG WAITS TILL WINTER,,,,SIMPLE HAS,,,,,,,,,,,,,,,,,,,,,,,,,,,