Platelets of affected dogs are bigger and their numbers are lower than usual. In addition, there are changes in neutrophils. The disease does not usually cause clinical signs, although bruising or bleeding tendencies may be noted during surgery. Human patients have been reported to develop renal disease, hearing problems, and cataracts, but these signs have not been observed in Pugs.

While this disorder is relatively mild, considerations for this disorder should be made before surgery, and any occurrence of excessive bleeding should be treated as appropriate.

There are many responsibilities to consider when breeding dogs. Regardless of test results it is important that your dog is in good general health and that you are in a position to care for the puppies if new responsible owners are not found. For first time or novice breeders, advice can be found at most kennel club websites.

This disease is autosomal dominant meaning that one copy of the mutation is needed for disease signs to occur. Use of dogs with one or two copies of the disease mutation for breeding is not recommended, as there is a risk that the resulting litter will contain affected puppies. For example if a dog with one copy of the MHA mutation is bred with a clear dog with no copies of the MHA mutation, about half of the puppies will have one copy and half will have no copies of the MHA mutation. Please note: It is possible that disease signs similar to the ones caused by the MHA mutation could develop due to a different genetic or clinical cause.