It can be, as in the example:
"This disease occurs in dogs." (modifies occurs, answers where)
As a prepositional phrase, it can be either, but more properly an adverb phrase. He studied the digestive process in dogs. (adjective, meaning of dogs) The disease is often found in dogs. (adverb)
By a virus adjective
An adverb phrase is two or more words that act as an adverb. It would be modified by an adverb or another adverb phrase.
adverb phrase
Adverb Phrase
No. But the prepositional phrase "in it" is an adverb phrase.
adverb
It is an adverb phrase (tells where).
An adverb phrase is two or more words that act as an adverb. It would be modified by an adverb or another adverb phrase.
adverb phrase
Adverb phrase
It is a prepositional phrase functioning as an adverb. Hint: A word or phrase that answers the question 'Where?' is functioning as an adverb (I think).