People are being urged to stop buying 'fashionable' flat-faced dogs after a rise in them being abandoned due to health problems.
Here's what to look out for if you are thinking of buying a pet:
What are flat-faced dogs?
Flat-faced dogs are Brachycephalic breeds - which mean their skulls are abnormally short for their species.
In recent years it has become a fashionable trait in dogs such as pugs.
They can often be seen on the arms of celebrities which has added to the trend.
What breeds of dog are affected?
Cavalier King Charles Spaniels
What health problems can they suffer from?
Severe breathing difficulties
Why are they getting such health problems?
Breathing problems occur as they have short necks and airways.
Dogs such as pugs now have a double curled tail which is essentially a genetic defect and can cause paralysis.
Flat-faced dogs often have to undergo surgery and can suffer health issues all their lives.
Pet owners often end up spending thousands on treatment for them.
What do vets say?
Vets say the creation of flat-faced breeds has "increased animal suffering".
Sean Wensley, President of the British Veterinary Association called it a "worrying trend" and urged would-be pet owners against buying them.
He said: "We strongly encourage people to think about choosing a healthier breed or crossbreed instead."