She took Albert home to clean his wounds.
Albert was left with several shattered teeth and a badly bruised jaw.
Mr Butcher was reunited with Albert after posting on Facebook looking for his lost dog.
He then confronted the animal officer who "swore black and blue" that he had nothing to do with Albert's injuries.
Mr Butcher was shown the movements of the only on-duty officer at the time of the attack.
After checking the van's GPS system the data showed the officer stopped on Henderson Rd at 12.53pm.
The woman who rescued the dog posted a photo on Facebook at 1.02pm.
The council said the officer would not have had enough time to beat the dog before the woman got home to write the post.
"Someone has done it and someone's got to be held accountable," Mr Butcher said.
His dog was kind-natured and "wouldn't hurt a fly". "This sort of thing just isn't on."
"I wouldn't be mad if he wasn't injured. It's fortunate another bulldog owner rescued him from a further beating."
Council chief executive Ross McLeod said the council takes allegations of this type very seriously.
"We have engaged an independent person to investigate the incident, and the investigation will continue today.
"Council is gathering information on the incident, including GPS data from the Animal Welfare Centre vehicles which will be analysed, and is also calling for
any witnesses to the incident to come forward."
"In particular, council would like to speak to the woman who returned the bulldog to its owner, in the hope she can give some clarity around the time it occurred and other relevant details," Mr Mcleod said.
Council protocol was to return a dog home free of charge if found wandering, for the first time, and if the dog was registered.
If it had been picked up previously, or was not registered, it was taken back to the welfare centre and impounded.
The council said it had faith in its animal control staff. Anyone with information about the incident should contact the council on 06 871 5056.