Vaccination in dogs and cats: principles and schedule

Vaccinate and Protect: Beyond the Simple Sting

A vacinação e um dos pilares mais importantes da medicina veterinaria preventiva. Longe de ser apenas uma “picada” anual, ela representa um compromisso serio com a saude e bem-estar do seu cao ou gato, estendendo-se a saude publica em casos de doenças zoonoticas. Muitos tutores questionam a necessidade da vacina anualmente, especialmente se o pet “nao sai de casa” ou “e um animal forte”. E fundamental entender que a proteção imunologica nao e uma fortaleza intransponivel construida de uma so vez, mas uma defesa que precisa de reforços estrategicos. O principio da vacinação e simples, porem poderoso: introduzir no organismo do animal agentes infeccosos enfraquecidos, inativados ou partes deles, para que seu sistema imunologico aprenda a reconhece-los e a produzir anticorpos. Estes anticorpos sao como soldados especializados, prontos para combater a ameaça real caso o animal seja exposto ao virus ou bacteria no futuro. Este processo cria uma “memoria imunologica”, capacitando o pet a reagir rapidamente e de forma eficaz, evitando que a doença se instale ou se manifeste de forma grave. Contrario ao que muitos pensam, mesmo um animal que nao tem contato direto com outros pets ou com o ambiente externo nao esta completamente seguro. Agentes patogenicos podem ser trazidos para dentro de casa em sapatos, roupas ou ate mesmo por insetos. Doenças como a cinomose, parvovirose e a panleucopenia felina sao altamente contagiosas e possuem alta taxa de letalidade, enquanto a raiva representa um perigo de saude publica irrefutavel. Por isso, nao ha espaco para a ideia de que um pet “e forte” o suficiente para resistir sem vacinas. A resistencia individual e um fator, mas a exposição a agentes virulentos sem nenhuma defesa previa e um risco incalculavel. A vacinação e um ato de responsabilidade que se inicia com a consulta a um medico veterinario, o unico profissional apto a avaliar o historico de saude do animal, seu estilo de vida e determinar o protocolo de vacinação mais adequado. Nao subestime este passo inicial; ele e o alicerce para uma vida longa e saudavel para seu companheiro.

Essential Shield: Knowing the Most Important Vaccines

The range of vaccines available for dogs and cats may seem complex, but they are divided between the so-called “ential” (core vaccines) and the “na essential” (non-core vaccines). Essential vaccines are those recommended for all animals regardless of lifestyle or geographic location due to the severity and prevalence of the diseases they prevent.Non-essential vaccines are indicated based on an individual risk analysis, considering factors such as exposure, environment and travel. For the ***cations*, essential vaccines include polyvalent (V8 or V10) and anti-rabies.

The multipurpose vaccine, usually labeled V8 or V10, protects against a devastating set of diseases:

• Distemper: A serious viral disease affecting various body systems (respiratory, gastrointestinal and neurological), with high mortality.
• Parvovirus It causes severe vomiting, bloody diarrhea, and rapid dehydration, especially dangerous for puppies.
• Canine Infectious Hepatitis: It affects the liver, kidneys and eyes.
• Adenovirus: Causes respiratory problems.
• Leptospirosis: A severe zoonosis, transmitted by rodent urine, affecting kidneys and liver, can be transmitted to humans. It is crucial that the veterinarian assesses the risk of exposure to decide on the inclusion of the most relevant Leptospirosis strains in the region.
• Variants such as Coronavirus may also be included, although their severity is usually less.

The vaccine **Antirrabica** is crucial and mandatory by law throughout Brazil. Rabies and a viral disease affecting the central nervous system of mammal, including human, and is invariably fatal once symptoms manifest. Its prevention and extreme importance for public health. For **cats**, essential vaccines comprise the polyvalent (V3, V4 or V5) and the anti-rabies.

The feline multipurpose vaccine protects against:

• Feline Panleukopenia: Also known as feline distemper, it is a highly contagious viral disease that causes vomiting, diarrhea, and bone marrow suppression, and is fatal to many puppies.
• Feline Viral Rhinotracheitis: It causes upper respiratory infections, with sneezing, runny nose and conjunctivitis.
• Calicivirosis Felina It also affects the upper respiratory tract, but can cause mouth ulcers and lameness.
• A Chlamydiosis (V4) and a Feline Viral Leukemia (FeLV) (V5) are considered non-essential, but their inclusion is strongly recommended for cats with outdoor access or contact with other cats.FeLV is a chronic and debilitating disease that suppresses the immune system, making cats susceptible to other infections and some types of cancer.

The vaccine **Antirrabica** has the same importance and obligation for cats as for dogs, due to the zoonotic and fatal character of the disease. As for non-essential vaccines, the decision must always be individualized. For dogs, there are vaccines against canine influenza (infectious tracheobronchitis) and against adverse giardiasis, for example.For cats, besides FeLV (for cats at risk), there are other sources that can be considered in very specific contexts. It is vital to stress: never acquire vaccines on their own account or try to administer them, the correct animal risk of being applied and safe storage is dependent on the correct animal use and storage.

The Immunization Journey: Schedules for Puppies and Adults

The vaccination schedule is not a fixed formula applicable to all pets, but a personalized plan, supervised by the veterinary doctor. It varies according to the species, the age of the animal, its health status, the environment in which it lives and the prevalence of diseases in the region. However, there are general principles that guide most protocols.

For Puppies: Building the Immunity of Zero

The puppy stage is the most critical for vaccination. Until 6-8 weeks of life, puppies are protected by maternal antibodies, transferred by first breastfeeding (colostrum). These antibodies are essential, but can interfere with the effectiveness of vaccines, creating a “window of susceptibility” where maternal protection has decreased, but the vaccine is not yet fully effective.Therefore, vaccination in puppies is done in a series of doses:

For **caes pups**:

• First dose: Usually between 6 and 8 weeks of life (Vaccine V8/V10 Multipurpose).
• Reinforcement doses: 2 To 3 additional doses of V8/V10 given every 21 to 30 days. Completing this cycle is critical for a solid immunisation.
• Antirrabic Vaccine: A single dose from 3-4 months of age, or as recommended by the manufacturer and the veterinarian, may be applied together with the last dose of the multipurpose, or at a different time.

For **puppy cats**:

• First dose: Between 8 and 9 weeks of life (Vaccine Polyvalent Feline V3/V4/V5).
• Reinforcement doses: 1 To 2 additional doses of the all-rounder every 21 to 30 days.
• FeLV vaccine (if indicated): For cats at risk, usually two doses, with an interval of 3-4 weeks, after the completion of the multipurpose or in parallel.
• Antirrabic Vaccine: A single dose from 3-4 months of age, or according to the protocol of the veterinarian.

It is imperative that the complete vaccination cycle is respected. Interrupting the process before the end means that the pet has not developed adequate protection, remaining vulnerable to diseases.

For Adults: Maintenance of Protection

Immunity conferred by vaccines is not eternal.Over time, antibody levels decrease, and the animal needs booster doses to maintain its protection.

For ** adult cats and dogs**:

• Annual reinforcement: Most vaccines, such as the multipurpose (V8/V10 and V3/V4/V5) and the antirabic, require an annual reinforcement. This is the most common and recommended practice in most veterinary clinics in Brazil, ensuring the continuity of immunity.
• Triennial protocols: For some core vaccines (specifically for distemper, parvovirus, hepatitis and panleucopenia), there are products that allow a reinforcement interval every three years.However, this is a decision that should be taken exclusively by the veterinary doctor, considering the type of vaccine used, the manufacturer's package insert and the risk profile of the animal. The anti-rabies vaccine also has versions valid for up to 3 years, but Brazilian law usually requires annual vaccination. Always check with the veterinarian and local authorities.

Adult animals with an unknown vaccination history should be considered as unvaccinated and follow an initial vaccination protocol adapted for adults, which usually involves two doses of the multipurpose vaccine and one dose of the antirabica, with appropriate intervals. The choice of schedule and types of vaccines is a dialogue between the tutor and the veterinary doctor.There is no single approach, and customization ensures maximum protection for your pet.

Continuous Care: Reactions, Myths and the Role of Responsible Tutor

After vaccination, it is natural for the tutor to observe the animal more closely.Mild reactions are common and generally self-limited, indicating that the immune system is working to develop protection.

Among the milder reactions, one can observe:

• Pain or tenderness at the site of application.
• Mild swelling at the injection site.
• Low fever.
• Decreased appetite and/or mild lethargy for 24 to 48 hours.

More serious reactions, although rare, can occur, such as vomiting, diarrhea, hives, swelling of the face, and in extreme cases, anaphylactic shock. If your pet shows any worrying signs or more intense reactions, immediately contact the veterinarian.

Demystifying Vaccination

In the internet universe, many myths about animal vaccination circulate. One of the most persistent is the idea that vaccines cause chronic diseases or even “autism” in pets, an unfounded parallel with myths of human vaccination.There is no scientific basis for these claims. The benefits of vaccination in preventing potentially fatal diseases far outweigh the risks of adverse reactions, which are low and generally controllable.

Another common myth is that elderly “pet no longer needs to vaccinate” This is a mistake. As animals age, their immune system may become less efficient, making them more susceptible to disease.Vaccination remains critical to protect the elderly, although the protocol can be adjusted by the veterinarian for each case.

When Vaccination Should Be Delayed

It is essential that the animal is healthy at the time of vaccination. A sick, febrile, diarrhoea-prone pet, receiving immunosuppressants or newly arrived from a rescue with poor health should not be vaccinated. In these cases, the immune system is already compromised and may not respond adequately to the vaccine, or the vaccine may aggravate the existing condition. The pregnant or lactating female should also not be vaccinated in most cases. A thorough clinical examination prior to application is essential to ensure that the animal is fit to receive the dose.

Where to Vaccinate and the Importance of the Card

In Brazil, vaccination should be carried out exclusively by veterinary doctors. This can occur in private veterinary clinics, veterinary hospitals university or in public vaccination campaigns, especially for rabies, promoted by city halls or state governments. These public campaigns, although free, are always supervised by veterinarians. The vaccination card is a vital document. It serves as a legal record of the vaccination history of your pet, containing dates, types of vaccines applied, stamp and signature of the veterinarian. This document is indispensable for travel, lodging in hotels for animals, day care and to keep the medical evidence and to always keep the health of the animal safe and to keep the animal safe.