In this episode, Steve Leonard investigates the latest research into mineral content in pet food, and discovers that many fail to meet official guidelines. Steve finds out whether feeding these foods to your pet over the long term could lead to serious health problems and uncovers what pet owners can do about it.

This episode comes from the Royal Veterinary College, near London.

In the third and final episode of the series, the team is based at Bristol University's Langford Vet Hospital.

Alice Rhodes discovers that one in five cats in the UK lives in a state of long-term anxiety because they share a house with another cat- and cats would rather live alone. Alice runs a unique experiment to test different stress-busting methods in three multi-cat households. Which will work best: separate food bowls, cat toys or stress-reducing scent diffusers?

Judy Puddifoot investigates the warning signs dogs give out before becoming aggressive. They follow a fairly predictable pattern but often go unnoticed by people. Judy reveals the signals to look for - and how they escalate if you ignore them.

Steve Leonard looks into the latest research that suggests feeding your cat only fish-based pet foods over the long term could lead to health problems.