A dog owner claims her pet died when a rubber Kong ball got stuck in its throat. Luna, a three-year-old German Shepherd, partially swallowed the red Signature ball while on a walk with Kayleigh Hellwing, 22. When the pooch collapsed, she was able to force the ball out of her throat and began CPR – but it was too late and Luna died in the park, Kayleigh said. Kayleigh, an RAF police dog handler from Lynn, is urging people with larger dogs to buy bigger toys, and do a CPR course. The mum-of-one said: “Me and my fiancé rehomed Luna whilst I was pregnant with Arthur. “I spent every day with her un…