have a look on google for any rescue charities for the mentioned dogs, or forums to do with the breed. I have an english bull terrier and there's a rescue for them. the wife wants a jack russell and theres 1 for that breed, its worth a look, forum would be better, try and also find out insurance prices ( our bullie costs more than my focus to insure) also try and find average life expectance and common illness

Thats my tuppence worth anyway