It's spring... and just like humans, pets also suffer from allergies, but instead of sneezing - they scratch - and scratch - sometimes until they bleed.

Why? Veterinary dermatologist Dr Danielle Hoolahan from Sydney's Animal Referral Hospital explains...

Additional Video Credits:
Twich - Boxer X - Video & image supplied by Kate Dawes + Bulldog scratches like a human - Huan Nguyen + Itchy Simon - Greyhound - Philip Shade
Videos used under Ceative Commons attributions