
I would also not take my entire male dog to visit a house with an in season bitch, it's just not worth the stress and hassle to all of us. It's tricky enough to juggle when my own bitch comes into season and I have to send him to stay with friends while she's at her peak time - she is far worse at hassling him than vice versa!
Regarding offering your Cocker at stud, they are a very overbred breed and although the vast level of pet breeding that goes on has led to a lot of very poor quality pedigrees and dogs, there is also no shortage of dogs like yours with good pedigrees, looks and temperaments out there. Your dog will need something to set him apart if he is to be considered by serious, reputable breeders and to objectively prove that he is of really good breed type and has something to offer the breed. If he is a show Cocker is he being shown with consistent good results? Or if he's a working Cocker is he being worked regularly and performing well at this and/or being competed in tests or trials to prove that he is fit for purpose? Cockers also require several health tests before breeding should be considered, the minimum being DNA testing for PRA and FN plus a one-off gonioscopy and an annual BVA eye test.