Pet dogs are taking part in a research project looking at the effects of Vitamin D on their health.
In the first of the studies, vets are assessing dogs that have had surgery to repair damage to their knee ligaments, with all of the animals involved having been injured spontaneously - typically while on a walk with their owners.
Researchers at the University of Edinburgh's Royal School of Veterinary Studies aim to improve health outcomes for pets receiving veterinary care.
The team will explore whether dogs can also produce vitamin D in their skin after exposure to the sun, in the same way that people do.
Previous studies have shown that animals with lower levels of vitamin D in their blood often show signs of increased inflammation. The team will examine whether inflammation linked to reduced intake can hamper dogs' recovery from surgery.
They will then monitor the dogs to see whether having higher levels of vitamin D before surgery has a positive effect on their recovery.
If a link is found, researchers will test if supplements can help to lower inflammation and improve chances of better recovery from surgery.
Dr Richard Mellanby, head of veterinary clinical research and companion animal sciences, said: "Vitamin D plays a vital role in bone health and there is growing evidence that it has other health benefits for people and animals.