WILBUR is one of two Mosman dogs who have recovered after what is believed to have been marijuana poisoning.

The three-year-old Cocker Spaniel is believed to have eaten marijuana on his morning walk through Clifton Gardens on Friday, and his owner Kate van Dijk said that later in the day Wilbur couldn't walk and was "really out of it and all over the place".

Wilbur was the second pup to present at Mosman Veterinary Clinic, with a Labrador brought in an hour earlier.

"We saw a four-year-old black lab with very, very unusual neurological signs which was very poorly, and had gone downhill rapidly since its morning walk, on which the owner had seen it eat something unidentified," Mosman vet Charlotte Surridge said.

"We stabilised it but it was deteriorating rapidly so we sent it off to the specialist hospital for further treatment.

"After some detective work from our vets it turned out that both dogs had been walked down the laneway in Clifton Gardens ... and both had eaten something while there.

"It was (later) concluded that they must have got into someone's ... drugs as both were showing signs of marijuana-toxicity."

Ms Van Dijk believed the Labrador found the drugs first.

"I think that the Labrador, who presented about an hour before ... Friday got the lion's share," she said.

"We think they may have found some hash cookies, because it doesn't seem likely they'd just eat it straight out."