If you want a single action, get a 45 colt. If you want a double action ,but still want a 45 colt get a .454 Casull or one of the old S&W model 25's is a 45 colt double action but very pricey. Ruger Redhawk is a good choice too.
44 special is also an option, as is 44 magnum
for a .357 magnum I like the S&W 686.
Strive to live up to the opinion that your dog has of you.