Yes, a successful breeding can happen without a tie.
There are some crosses that tend to be remarkably uniform, but I don't think that Pug x Chihuahua is one of them.
Pugs can have serious complications with whelping, due to their conformation. If she does end up pregnant, then you will need to either arrange for a c-section to be done, or have contingency plans for an emergency c-section if she has a pup get stuck or something else go wrong during whelping. You will need to find someone experienced in breeding and raising puppies who can help you through the initial whelping (either natural or c-section) and neonatal phase. Knowing when a bitch or puppy is in trouble, and knowing what to do for them is vital.
There are some crosses that tend to be remarkably uniform, but I don't think that Pug x Chihuahua is one of them.
Pugs can have serious complications with whelping, due to their conformation. If she does end up pregnant, then you will need to either arrange for a c-section to be done, or have contingency plans for an emergency c-section if she has a pup get stuck or something else go wrong during whelping. You will need to find someone experienced in breeding and raising puppies who can help you through the initial whelping (either natural or c-section) and neonatal phase. Knowing when a bitch or puppy is in trouble, and knowing what to do for them is vital.