My dog has a UTI. How much Sulfameth/trimethoprim should I give?

The usual dose used is 15mg/kg but you could go as high as 30mg/kg; so a 26# dog would need between 177mg to 354mg twice a day. I do think the dose is high so please call your vet and ask. Personally I would use 1/2 of a 480mg tablet twice a day. The person who filled the prescription may have made an error. The drug is very safe so I would not be worried about it's safety. Remember, any drug can cause side effects but I use this drug A LOT and very rarely see any side effects and if I do, they are usually mild. ( https://www.petplace.com/article/drug-library/drug-library/library/trimethoprimsulfadiazine-tribrissen-for-dogs-and-cats/ )

Dosage would depend on weight (so please indicate it in a further post). We would not be allowed to tell you this drug is fine as it is for human beings and ideally an equivalent for dogs should be administered first. 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.

The average dosage of SMZ-TMP for dogs is about 13mg per pound given once daily. For a 50 pound dog this would be about 650mg daily. However, if you need to give a medication such as SMZ to your dog it is best to contact your local veterinarian for the correct dosage and usage information as this dosage can vary depending on your dog's personal needs or illness. Antibiotics should only be given under direct veterinary supervision as the antibiotics you have on hand may not be the correct dosage or even type for your dog's current condition. Giving a medication in the wrong dosage or frequency may make the illness worse or cause side effects that are detrimental to your dog.

Hello. It is unfortunately impossible for us to recommend using human medication without knowing there is a real problem with your pet. At best, you may be giving an unnecessary medication & at worse, you may be treating inappropriately & causing a simple infection to become much worse. It is best to consult with your vet who knows your pet better & see if this antibiotic is appropriate based on her symptoms. Thanks for using Petco Pet Education Center, formerly Petcoach.

Hello and thank you for reaching out to Petco Pet Education Center, formerly Petcoach. Love Saki’s name! You are correct in your calculation, but 250 mg is not too much for Saki. Clavamox is only available in certain tablet sizes, including 125mg and 250mg. We never want to under-dose antibiotics, so we will often round up to the next best tablet size. As long as Saki is taking the antibiotic with food, GI side effects should be minimal. I hope this is helpful!

Thanks for using Petco Pet Education Center, formerly Petcoach! This depends solely on her weight. If she truly is 105 pounds like it says on her profile, then this should be fine as that would be actually a low dose. The use of antibiotics without a proper veterinary evaluation is not recommended as it can result in antibiotic resistance, especially if the patient is underdosed chronically. If Bella has not been evaluated by a veterinarian, I would recommend she is before continuing any antibiotics. Good luck and have a good night!

I am sorry to hear your pup Zarina may have a urinary tract infection (commonly known as UTIs). Before I explain why, it is not a good idea to start antibiotics. UTIs are frequently caused by bacteria in the urinary bladder or the urethra. Female dogs are more prone to developing UTIs but any dog can be pre-disposed to UTIs if they have any urinary stone formation. Given that we are unsure if Zarina has a UTI, I would recommend a veterinary visit to confirm that she does in fact have one. They typically take a urine sample and look for bacteria and cells. If they see crystals or evidence of possible stone formation, they may recommend a radiograph of her bladder as well. If she does have UTI, it is important to choose the right antibiotic with the right dose and frequency. Typically, dogs are treated for UTIs with a 10-14 day course of antibiotics. Since UTI's can be painful and irritating, I recommend finding a veterinarian sooner rather than later to confirm and get the proper treatment. I hope this is helpful and feel free to start a consultation if you need more information! Good luck and I hope Zarina feels better!