My BC Loki has developed a cough everytime she picks up the throw toy she plays with, it's not a bad cough per say but she coughs and hacks like she is trying to dislodge something from her throat. My other dog plays with the toy too and she is fine. Both dogs are wormed regularly so it's definately not heartworm or anything like that. I was thinking maybe it was fibres from the toy or bits of grass that she may swallow? She's only being doing it for a few days, and it doesn't happen when she runs and plays without the toy. Any suggestions would be great.