HARLINGEN — The husky and German shepherd struggled with youthful energy as their owner instructed them.

“Here you go, sit,” said Aurelio Morales as the husky, Pixie, and Rex the German shepherd stepped onto the scales.

Morales had brought Pixie and Rex all the way from Pharr for the monthly Humane Society of Harlingen Vaccination Clinic. More than 500 dogs and cats descended on the Humane Society at 1106 Markowsky Ave. yesterday morning. A simple rabies shot could be given for only $12. A combination of rabies and the FHCP cat vaccination goes for $25.

“We were busier than anticipated,” said Terren Tull, director of operations for the Humane Society of Harlingen.

“We want to support the public since we know that the financial part of owning a pet can be difficult,” she said. “It’s good for pet health and safety.”

Dogs and puppies were given vaccinations for rabies, distemper and other conditions. Attendants screened them for heart worms and, if necessary, treated them with de-worming medication. Cats were also vaccinated against rabies and some other diseases.

Several lines stretched across the parking lot as owners waited for the proper station, whether it be for dogs, cats, heart worm testing or just to get their nails trimmed. The Humane Society of Harlingen offers these vaccination clinics each month.

Many animal lovers had brought rescue pets for vaccination. Yessica Guajardo had brought Lola, a sleek black cat, who turned around in her roomy cage.

“She’s one of my rescues,” said Guajardo, who’d driven all the way from San Benito.

“I take them and get them fixed and I just let them hang around at my house,” she said.

Guajardo thanked the Humane Society of Harlingen for holding the monthly clinics.

“I try to take advantage every time they have it,” she said.

Owners stood with pets psyched by all the activity, or perhaps shaking with fear from it. A man with a thick beard cradled his white spotted dog as he waited in line, a puppy shivered as it was given de-worming medication, cats hid in their cages surrounded by cover.

“Come on girls,” said a woman in a pink top as she led two frisky dogs away.

Morales said he appreciated the Humane Society offering the clinic.

“It’s great that you can get affordable vaccinations for your dogs,” he said. “I’ve been bringing them since they were small.”

The two dogs, about 4 years of age, showed an eager vitality as they struggled with the leashes, anxious to return home.

“Vaccinations are very important,” Morales said, and then, looking down at his dogs, added, “They are part of my family.”