No it does not. The same dosage is given to large as to small dogs.
Yes it do affect the dogs health and the dog becomes lassy
You will need to check with your vet. It will depend on the weight and medical condition of the dog.
No...the dosage may be too much for a chihuahua to handle. Your vet can give you the right dewormer and dosage for your chihuahua's weight.
rabies
Any size dog can have a reaction to vaccines. It is rare to see it with a Rabies vaccine as that is a killed vaccine. With the DHLP/Parvo vaccine sometimes, but rarely, the dog will react to the Lepto part of this combination vaccine, Distemper, Hepatitis, Lepto, Parainfluenza & Parvo. If your pet had a true reaction such as swelling up within 5-10 minutes of receiving the vaccination, then just leave out the lepto part of the vaccine the next time your pet is due for the next vaccination. Just ask your Vet about this or if you give your own vaccinations, get a vaccine without the lepto in it.
10 mg
Surprisingly enough, the answer is yes. Claritin is safe to use for dogs to relieve itching. Claritin-D should not be used on dogs, as it contains pseudoephedrine. Also, Claritin contains propylene glycol and should not be used on cats. Dosage for dogs is about half of the recommended human dosage for medium sized dogs, and about a quarter dosage for small dogs.
Whatever dose your Vet prescribes!
Aspirin is not toxic to dogs, but too much would be harmful, and perhaps even deadly. Dogs can be given aspirin in appropriate amounts based on their age and weight. You should consult a vet to determine a proper dosage.
Generally it should be; however, it is better to ensure absolute protection and administer the next weight dosage.
Vitamin water is not recommended for dogs. In a small dosage it will not harm most dogs usually though.
The rabies vaccine is the only injection legally required for dogs in many jurisdictions.