can tortoises get infections from inside a normal house?

by Matt
(nottingham england)

recently my 4 year old hermanns tortoise has been getting very restless and since its winter, he cant really be outside so i have started letting him wander round the house from around 5pm to 10pm. there are also two dogs around as well, but they will definately not attack him, so i was wondering if he can catch an infection from them or anything else?

also can you think of a reason why he is suddenly so restless? thanks!