Chug (Low Risk Brachycephalic Breed)
Chugs are a cross between chihuahuas, which can be brachycephalic (if apple headed chihuahuas) and Pugs which definitely are a high risk brachy breed. Many cross bred dogs do not have the issue and whether your Chug is likely to suffer from BOAS is entirely dependant upon its breeding.
Like all the low risk Brachycephalic breeds as they age or if they are overweight they tend to be less tolerant of heat and in any situation where they do become stressed or anxious for any reason, even due to other unrelated health issues they may have more difficulty breathing which can exacerbate the problem.
We therefore do still have to ensure that owners are aware that we consider them to be a breed at risk during transport, that we will make transport decisions as best we can based on the information provided by the owners rather than requiring veterinary checks and that there are additional terms & conditions they need to be aware of and accept.