My dog killed a rat. Why is he sick with a lump, limping, and pain?

Thank you for contacting Petco Pet Education Center, formerly Petcoach with your question about Dude. That’s not good. Rats carry many diseases like leptospirosis, which can pass along to a dog. In addition, if the rat was poisoned with rat poisoning, that will make the dog sick and kill them. I’m very concerned about him and I think he needs to see a vet immediately. Please take him into an ER vet now. Best of luck.

You are correct that the rat can carry diseases. I recommend to call your veterinarian and tell them what happened. They may want to check him for any bites and booster his vaccines. The main concerns for rats are Leptospirosis and fleas who can carry plague depending on where you live. Theoretically, rabies and rat poison ingestion would also be a risk. Your veterinarian will be most familiar with your local environment and the potential diseases. Also make sure Brady is up-to-date on his flea prevention. Best of luck and please feel free to post any additional questions.

There are a couple things you should be concerned about, if your dog is not vaccinated then leptospirosis is a concern as Rats carry it and it is a serious disease in dogs (affecting the kidneys and liver). the main second concern is rat poison, if the rate ingested rat poison in the past couple weeks, then your dog could be poisoned too, these poisons are usually blood thinner which cause an animal to bleed to death, often it has a delayed action and the treatment for that is vitamin K, which must be given by your vet by injection first.

Poor Capi! Sometimes rats are easier to catch for dogs due to rat poison, which can be very dangerous to dogs. Capi can be throwing up due to an intestinal obstruction from the actual rat carcass or have internal bleeding as some rat poisons contain anticoagulant toxins. I recommend having him seen by a vet right away, as he may need supportive care or vitamin K supplements (to replace the ability of platelets to clot). I hope this helps and am happy to answer any other questions you may have!

[Rabies](https://www.petcoach.co/dog/condition/rabies/) in rats and other small rodents is extremely rare. I would be more concerned with the possibility that the rat had been poisoned elsewhere and its weakness was why your dog was able to catch and kill it. Leptospirosis, an infectious disease that affects the liver and/or kidneys, is also a high risk from contact with rats. Other possible diseases your dog could contract from contact with rats are: • Rat Bite Fever (*Streptobacillus moniliformis* form). Dogs can be infected by the bacteria by biting or eating infected rats. Dogs do not themselves get sick, but serve as carriers for the infection, passing it along to humans. • [Tularemia](https://www.petcoach.co/article/tularemia-rabbit-fever-in-dogs) is caused by the *Francisella tularensis* bacterium. Rabbits, hares and rodents, including rats, are particularly susceptible to the organism, and often die in large numbers during an outbreak. If a dog eats a rat (or other animal) infected by this organism or drinks water contaminated by infected rodent waste, the dog can become ill as well as passing the disease on to humans. Symptoms in dogs include refusal to eat, fever, cough, vomiting, and diarrhea. If not caught and treated, it can lead to death. In humans the symptoms are specific to the mode of infection (deer fly, ticks, contaminated water, handling dead infected animals, etc.) but can include: chills, eye irritation, fever, headache, joint stiffness, muscle pain, ulcers on skin, shortness of breath, sweating and weight loss. • [Bubonic plague](https://www.petcoach.co/dog/condition/plague): dogs can become carriers of the *Yersinia pestis* bacterium if they are bitten by the flea of an infected rat. Dogs do not tend to be sickened by bubonic plague but can pass the disease on to human caretakers. • [Salmonellosis](https://www.petcoach.co/article/small-pet-rodents-can-pose-a-salmonella-risk-to-humans) can be transmitted to a dog that encounters the fecal material of rats, other rodents and especially reptiles. Symptoms in canines include: fever, diarrhea, dehydration and shock. Death can occur if untreated, and the dog can spread the infection to human through its feces.

Examine your dog for any sign of injury due to the fight with the rat (if any). If any (which is likely, sometimes even inside the mouth) take him to your veterinarian for an examination. Disinfection can eventually be started at home with very diluted hibiscrub or betadine or salted water baths. Buster collar may be useful as well to avoid licking/scratching at the wound. If your dog is not vaccinated for Leptospira, take him to your local vet anyway. Antibiotics may be needed. Please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.

You probably do not need to be concerned since Puppy did not actually eat the rat. However, if you feel like she is acting abnormally, like vomiting or coughing excessively or acting more lethargic than normal, I would recommend taking her in to the vet just to make sure nothing is going on. There are some diseases that can be spread from rat to dog but with such limited interaction Puppy is probably fine. My only other concern would be if there was any rat poison around that the rat or Puppy could have gotten in to. If so, this could cause some bleeding issues in Puppy. Your vet can run a simple blood test to make sure this is not an issue.