any advice on re acuring chest infection

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exuse my spelling i cant spell , ha ha im just after some advice about

why caitlyn gets so many chest infections one after another i have 3

dogs that caitlyn wont stay away from crawling all over and trying to

climb the stairs my dogs stay in the kitchen only so we try and make

her stay away cos dog hairs will not be good for her i also have a

guinea pig that has just had 5 babys i dont use hay when caitlyns

around cos that wont be good for her iether. when caitlyn has a realy

cold i think she swallows the snottys and because everything goes to

her lungs it causes a chest infection any advice about how to minimize

the risk of chest infections ie i dust just before caitlyn comes to

mine am i been silly or what any idears thanks rita