Overheating

Because of the flat face and short snout, pugs may have a hard time dissipating that extra heat in the summer months, or in a warm winter home. They can become very ill and heat exhaustion is not at all uncommon if they are outdoors for extended periods of time. They can’t get rid of that heat easily with panting like other dogs can. Taking them outdoors in the hot weather is a short term adventure,  and also make sure that you’ve got water with you to give them even if you’re only going out for a very short time.

Breathing problems:

Pugs may be prone to breathing problems also due to the flat face and curled snout. They tend to make snorts and snuffs, and will quite often snore excessively. They make amazing noises designed to make you just howl laughing but do take care that if they seem to be having trouble breathing you make a fast appointment with the vet. We’ve never had issues, but have been told that they get sinus infections that can cause discomfort.
Allergies

Pugs can also be sensitive to certain allergens such as smoke and other things, and will get paws and ears that are itchy, as well as hot spots on their skin. Make sure the spots are allergy in nature and not a product of fleas or mites to keep your pet healthy.

Anesthesia for Surgery
If your pet needs surgery, select a vet wisely who knows the problems that pugs can have tolerating anethesia. They do have special needs with regard to it